BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Do Lyapunov exponents measure chaos? DTSTART;VALUE=DATE-TIME:20260413T160000Z DTEND;VALUE=DATE-TIME:20260413T162000Z DTSTAMP;VALUE=DATE-TIME:20260414T202359Z UID:indico-contribution-94-283@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Jorge Kurchan (ENS Paris)\nThe solar system has a re latively large Lyapunov exponent\, and yet has been stable for much longer than the inverse Lyapunov time. Similarly\, almost integrable systems lik e the low energy Fermi-Pasta-Ulam chain take much longer to thermalize tha n one would expect from their Lyapunov exponent.\nThis phenomenon has more recently been studied in quantum systems.\n\nEl sistema solar tiene un ex ponente de Lyapunov relativamente grande y\, sin embargo\, ha permanecido estable durante mucho más tiempo que el inverso del tiempo de Lyapunov. D e manera similar\, sistemas casi integrables como la cadena de Fermi–Pas ta–Ulam a baja energía tardan mucho más en termalizar de lo que cabrí a esperar a partir de su exponente de Lyapunov.\nEste fenómeno ha sido es tudiado más recientemente en sistemas cuánticos.\n\nhttps://fisindico.un iandes.edu.co/event/23/contributions/283/ LOCATION:Universidad Nacional de Colombia Ed. 564 URL:https://fisindico.uniandes.edu.co/event/23/contributions/283/ END:VEVENT BEGIN:VEVENT SUMMARY:The complex evolution of chess openings DTSTART;VALUE=DATE-TIME:20260416T193000Z DTEND;VALUE=DATE-TIME:20260416T195000Z DTSTAMP;VALUE=DATE-TIME:20260414T202359Z UID:indico-contribution-94-305@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Rafael Hurtado (Universidad Nacional de Colombia)\nC hess is a board game that demands deep positional understanding from the v ery first move of the opening to the end of the game. The initial moves\, by both White and Black\, contain information at the individual level abou t each player’s strengths\, knowledge of the adversary\, and personal pr eferences\, as well as broader insights into the state of the art of the g ame itself. The evolution of chess can be traced back to the fifteenth cen tury\, with major transformations linked to the formal establishment of ru les—such as Ruy López’s treatise—\, the beginning of organized tour naments in London\, the formation of FIDE—Fédération Internationale de s Échecs or International Chess Federation\, and the establishment of the Chess Olympiads. Several tournaments have been reserved for high-level pl ayers\, with selection processes ranging from direct invitations\, such as the Hastings call\, to eliminatory systems like the Chess Olympiads and t he World Championship Candidates Tournament. Participants in these events bring well-established strategies and techniques\, and innovations that em erge from the global practice of chess.\nIn this study\, we analyze the de velopment of chess openings over the course of a century\, using the compl ete dataset of matches played in the Olympiads from 1924 to 2024. We combi ne two theoretical and methodological approaches: on one hand\, we represe nt matches and tournaments using graphs\; on the other\, we apply entropy measures and complexity indices to explore and trace the organizational pr ocesses underlying the evolution of the game. Graphs are constructed by ad ding directed dyads corresponding to the first move of each match\, with n odes representing Black’s responses to White’s moves using Descriptive Notation (e.g.\, Pawn to King 4 as PK4)\, recorded in a 20×20 matrix. We compute the following measures of complexity: Shannon entropy\, Tsallis e ntropy\, the Shiner-Davison-Landsberg complexity index\, and the López-Ru iz-Mancini complexity index—based on both degree and strength of the nod es. These are analyzed across three match outcomes: White wins\, Black win s and draws. In- and out-degree and strength are associated with the playe r’s perspective (White or Black)\, while outcomes are treated as subsyst ems to estimate Tsallis entropy. Our results show that chess has evolved t owards increasing diversity\, due to broader explorations and preferences for rare strategies\, reflecting both innovation and adaptation to evolvin g winning patterns: While Shannon entropy captures the growing dispersion of opening choices and shifts in player´s preferences\, and complexity in dices highlight rising interdependence between moves\, assuming superaddit ivity Tsallis entropy parameter (q)\, ranges from 1.1 to 3.0\, signals a t ransition toward correlated structures.\n\nhttps://fisindico.uniandes.edu. co/event/23/contributions/305/ LOCATION:Universidad de los Andes ML-513 URL:https://fisindico.uniandes.edu.co/event/23/contributions/305/ END:VEVENT BEGIN:VEVENT SUMMARY:Sobreviviendo la era de LLMs DTSTART;VALUE=DATE-TIME:20260414T210000Z DTEND;VALUE=DATE-TIME:20260414T212000Z DTSTAMP;VALUE=DATE-TIME:20260414T202359Z UID:indico-contribution-94-282@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Raul Ramos Pollán (Universidad de Antioquia)\nSi bi en los LLMs han irrumpido con excepcional fuerza en el campo de la IA con una percepción de un potencial de impacto y cambio enorme\, su adopción para resolver problemas en la práctica sigue planteando muchísimos retos . Su naturaleza como modelos estadísticos del lenguaje es la causa princi pal de estas dificultades y\, en ese contexto se han creado muchas técnic as que permiten abordar parte de estos retos en distintas circunstancias. Esto incluye técnicas como grounding\, continual pretraining\, thinking m odels\, etc. En esta charla revisaremos algunos casos en la industria y en la investigación donde relucen estas limitaciones y las aproximaciones q ue con las que estamos intentando explotar ese potencial prometido.\n\nhtt ps://fisindico.uniandes.edu.co/event/23/contributions/282/ LOCATION:Universidad Nacional Ed. 564 URL:https://fisindico.uniandes.edu.co/event/23/contributions/282/ END:VEVENT BEGIN:VEVENT SUMMARY:La Relación de Crooks aplicada a sistemas de dos osciladores arm ónicos acoplados simulados bajo movimiento browniano DTSTART;VALUE=DATE-TIME:20260416T213000Z DTEND;VALUE=DATE-TIME:20260416T215000Z DTSTAMP;VALUE=DATE-TIME:20260414T202359Z UID:indico-contribution-94-320@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Jose Daniel Muñoz Castaño (Departamento de Física \, Universidad Nacional de Colombia\, Bogotá)\nLa Relación de Crooks [1] \, uno de los teoremas de fluctuación\, es hoy en día un método estánd ar para calcular diferencias de energía libre entre dos estados de un sis tema utilizando procesos fuera del equilibro. En el presente trabajo const ruimos un sistema de dos osciladores armónicos de masa y resorte en un b año térmico acoplados por un tercer resorte\, y simulamos mediante diná mica browniana el proceso directo por el cual separamos los osciladores ha sta que el enlace entre ellos se rompe\, para luego volver a juntarlos en un proceso reverso durante el cual el enlace entre ellos se restablece. En un segundo sistema\, el resorte de acople vuelve a aparecer al final del proceso de estirado. Al trazar las curvas de fuerza vs. elongación y medi r para muchas repeticiones los histogramas de los trabajos realizados en l os procesos directo y reverso\, es posible usar la Relación de Crooks par a calcular la diferencia de energía libre entre los estados inicial y fin al. Nuestros resultados evidencian que la Relación de Crooks es capaz de predecir con exactitud del 1% la diferencia de energía libre entre los en sambles canónicos inicial y final\, incluso al ejecutar el protocolo con velocidades tres órdenes de magnitud mayores que las de la evolución cua si-estacionaria. Además\, las curvas obtenidas de fuerza vs elongación s e asemejan a las obtenidas en experimentos con horquillas de ARN [3]. Los sistemas propuestos no sólo ilustran el funcionamiento y significado conc eptual de la Relación de Crooks\, sino que también podrían usarse como punto de partida para construir modelos simplificados de moléculas bioló gicas.\n\n[1] Crooks\, G. E. Phys. Rev. E 60\, 2721-2726 (1999).\n[2] Juli án David Jiménez Paz\, “La relación de Crooks: trabajo y energía lib re en osciladores acoplados fuera del equilibrio”\, Trabajo de Grado\, F ísico. Director Prof. José Daniel Muñoz\, Universidad Nacional de Colom bia\, Bogotá (2024).\n[3] D. Collin et. al\, Bustamante\, C. et al. Natur e 437\, 231-234 (2005).\n\nhttps://fisindico.uniandes.edu.co/event/23/cont ributions/320/ LOCATION:Universidad de los Andes ML-513 URL:https://fisindico.uniandes.edu.co/event/23/contributions/320/ END:VEVENT BEGIN:VEVENT SUMMARY:Antifragility of stochastic transport on networks with damage DTSTART;VALUE=DATE-TIME:20260413T210000Z DTEND;VALUE=DATE-TIME:20260413T212000Z DTSTAMP;VALUE=DATE-TIME:20260414T202359Z UID:indico-contribution-94-280@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Leidy Katherin Eraso Hernandez (Universidad Nacional Autónoma de México)\nA system is called antifragile when damage acts as a constructive element improving the performance of a global function. In this work\, we analyze the emergence of antifragility in the movement of random walkers on networks with modular structures or communities. The ran dom walker hops considering the capacity of transport of each link\, where as the links are susceptible to random damage that accumulates over time. We show that in networks with communities and high modularity\, the locali zation of damage in specific groups of nodes leads to a global antifragile response of the system improving the capacity of stochastic transport to more easily reach the nodes of a network. Our findings give evidence of th e mechanisms behind antifragile response in complex systems and pave the w ay for their quantitative exploration in different fields.\n\nhttps://fisi ndico.uniandes.edu.co/event/23/contributions/280/ LOCATION:Universidad Nacional Ed. 564 URL:https://fisindico.uniandes.edu.co/event/23/contributions/280/ END:VEVENT BEGIN:VEVENT SUMMARY:Interplay of quantum resources: magic-protected entanglement DTSTART;VALUE=DATE-TIME:20260417T195000Z DTEND;VALUE=DATE-TIME:20260417T201000Z DTSTAMP;VALUE=DATE-TIME:20260414T202359Z UID:indico-contribution-94-350@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Julian Rincón (Universidad de los Andes)\nEntanglem ent and magic (non-stabilizerness) are widely regarded as necessary for qu antum universality and potential advantage. Yet the form in which they mus t appear within a quantum state remains unclear. We introduce an operation al diagnostic of their interplay: \\emph{magic-protected entanglement}\, d efined as entanglement remaining after optimal stabilizer (Clifford) proce ssing. This reframes the heuristic ``entanglement~+~magic'' as a sharp ope rational question: how much entanglement is intrinsically linked to magic. This perspective endows the state space with structure\, distinguishing \ \emph{T-magic}--type states\, where magic is injected locally and entangle ment can often be removed by stabilizer processing\, from \\emph{W-magic}- -type states (including Dicke and non-stabilizer hypergraph families)\, wh ose entanglement cannot be completely undone by Clifford circuits. The res ulting separation enables a principled discussion of nonlocal quantum reso urces.\n\nhttps://fisindico.uniandes.edu.co/event/23/contributions/350/ LOCATION:Universidad de los Andes ML-513 URL:https://fisindico.uniandes.edu.co/event/23/contributions/350/ END:VEVENT BEGIN:VEVENT SUMMARY:Preisach-percolation dynamics of multilevel resistive switching in phase-separated LPCMO DTSTART;VALUE=DATE-TIME:20260416T153000Z DTEND;VALUE=DATE-TIME:20260416T155000Z DTSTAMP;VALUE=DATE-TIME:20260414T202359Z UID:indico-contribution-94-284@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Juan Gabriel Ramirez (Universidad de los Andes)\nWe investigate the complex interplay of competing phases in bulk La$_{5/8−x }$Pr$_x$Ca$_3/8$MnO$_3$ (LPCMO) to demonstrate the coexistence of volatile and non-volatile multilevel resistive switching (RS) within a single devi ce. In this system\, ferromagnetic metallic (FM-M) and chargeordered insul ating (COI) phases spatially coexist across a broad ∼160 K temperature w indow. While volatile RS is driven by a reversible\, electrically induced metal-insulator transition\, the non-volatile RS is governed by the therma l history of the FM volume fraction. Specifically\, voltage pulses that he at the device into a critical 90–210 K window permanently alter the phas e fraction\, modulating the resistance by up to seven orders of magnitude (∼300 Ω to ∼109 Ω). The metallic state is fully recoverable by cyc ling the temperature above the charge-ordering threshold (∼210 K). To qu antitatively capture this phase-fraction control\, we implement a Preisach –percolation framework. Calibrated directly from experimental R–T hyst eresis loops without free parameters\, the model extracts domain switching distributions and utilizes a percolation threshold of $p_c = 0.65$ to suc cessfully predict both macroscopic resistance at 2 K and magnetization at 5 K following specific thermal pathways. Ultimately\, we demonstrate the s tabilization of three distinct\, highly reproducible resistance states ove r 25 cycles with ratios exceeding $10^3$\, showcasing phase-fraction engin eering as a robust mechanism for multilevel memory in correlated oxides. \ n\nKeywords: resistive switching\, phase separation\, Preisach model\, per colation theory\, LPCMO\, neuromorphic computing. \n\nAcknowledgements\nTh is work was conducted in collaboration with Diego Carranza-Celis (Universi dad de los Andes)\, Pavel Salev (University of Denver)\, Ali C. Basaran (G eneral Atomics)\, and Ivan K. Schuller (UC San Diego). J.G.R. acknowledges support from the Facultad de Ciencias and Vicerrectoría de investigacion es of Universidad de los Andes. This work was also supported by Project No . INV2021-128-2313 of the Faculty of Science at Universidad de los Andes\, Bogotá\, Colombia. The research at University of California\, San Diego was supported by the U.S. Department of Energy’s Office of Basic Energy Science\, under Grant No. DE-FG02-87ER45332.\n\nhttps://fisindico.uniandes .edu.co/event/23/contributions/284/ LOCATION:Universidad de los Andes ML-513 URL:https://fisindico.uniandes.edu.co/event/23/contributions/284/ END:VEVENT BEGIN:VEVENT SUMMARY:Path integral approach to work beyond the two-point measurement sc heme DTSTART;VALUE=DATE-TIME:20260417T210000Z DTEND;VALUE=DATE-TIME:20260417T212000Z DTSTAMP;VALUE=DATE-TIME:20260414T202359Z UID:indico-contribution-94-360@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Carlos Viviescas (Universidad Nacional de Colombia)\ nThe conventional approach to characterize work statistics in driven quant um systems is the two-point measurement scheme (TPMS)\, where work is defi ned as the difference between two projective energy measurements performed at the beginning and end of an evolution protocol. This scheme has been s hown to be consistent with classical stochastic thermodynamics [1]\, and t o enable the identification of a work functional that converges to its cla ssical counterpart in the semiclassical limit [2].\n\n\nDespite its import ance\, since the initial projective energy measurement suppresses coherenc es in the initial state\, the TPMS is not suited to assess the role of ini tial coherence in quantum thermodynamics. In this work we present a path i ntegral formulation of two alternative schemes that preserve initial coher ences and are consistent with the TPMS for incoherent states described by quasi-probability distributions: i) the Margenau-Hill (MH) scheme [3]\, wh ere the explicit introduction of the initial projective measurement is avo ided by introducing an estimation of the initial Hamiltonian based on proj ective measurements at the end of the protocol only\, and ii) the so-calle d full counting statistics scheme [4]\, where the characteristic function is related to the phase accumulated by a detector coupled to the system. \ n\n\n[1] Lostaglio\, M. (2018). Quantum fluctuation theorems\, contextuali ty\, and work quasiprobabilities. Physical review letters\, 120(4)\, 04060 2.\n\n[2] Funo\, K.\, & Quan\, H. T. (2018). Path integral approach to qua ntum thermodynamics. Physical review letters\, 121(4)\, 040602. \n[3] Pei\ , J. H.\, Chen\, J. F.\, & Quan\, H. T. (2023). Exploring quasiprobability approaches to quantum work in the presence of initial coherence: Advantag es of the Margenau-Hill distribution. Physical Review E\, 108(5)\, 054109. \n\n[4] Solinas\, P.\, & Gasparinetti\, S. (2016). Probing quantum interfe rence effects in the work distribution. Physical Review A\, 94(5)\, 052103 .\n\nhttps://fisindico.uniandes.edu.co/event/23/contributions/360/ LOCATION: URL:https://fisindico.uniandes.edu.co/event/23/contributions/360/ END:VEVENT BEGIN:VEVENT SUMMARY:El escalamiento temporal de la temperatura de los sistemas complej os: Una nueva propiedad en la naturaleza DTSTART;VALUE=DATE-TIME:20260416T195000Z DTEND;VALUE=DATE-TIME:20260416T201000Z DTSTAMP;VALUE=DATE-TIME:20260414T202359Z UID:indico-contribution-94-281@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Carlos José Quimbay Herrera (Universidad Nacional d e Colombia)\nLos sistemas complejos presentan diferentes tipos de escalami ento\, tales como el escalamiento de la fluctuación temporal caracterizad a por el hecho de que la dispersión de los datos en una serie de tiempo n o estacionaria (cuantificada mediante la variancia) satisface una relació n de ley de potencia con respecto al promedio de los datos\, o el escalami ento del Theil temporal en el que la dispersión de los datos en una serie de tiempo de trayectoria difusiva (cuantificada mediante el índice de Th eil) satisface una relación de ley de potencia con respecto al promedio d e los datos mediante una expresión que tiene cierta similitud con la exis tente en las transiciones de fase de segundo orden. El objetivo principal de esta charla es mostrar la existencia en la naturaleza de una nueva rela ción de escalamiento\, en la que la temperatura de los sistemas complejos definida como el primer momento central absoluto se relaciona mediante un a ley de potencia con respecto al promedio de los datos. La anterior relac ión de ley de potencia\, que es denominada escalamiento temporal de la te mperatura de los sistemas complejos\, está presente en diferentes tipos d e sistemas complejos de naturaleza económica\, social\, financiera\, mete orológica\, epidemiológica\, etc.\n\nhttps://fisindico.uniandes.edu.co/e vent/23/contributions/281/ LOCATION:Universidad de los Andes ML-513 URL:https://fisindico.uniandes.edu.co/event/23/contributions/281/ END:VEVENT BEGIN:VEVENT SUMMARY:StatMech Insights on Na+/I− Symporter transport cycle DTSTART;VALUE=DATE-TIME:20260417T212000Z DTEND;VALUE=DATE-TIME:20260417T214000Z DTSTAMP;VALUE=DATE-TIME:20260414T202359Z UID:indico-contribution-94-349@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Alfonso Leyva (Pontificia Universidad Javeriana)\nTh e intrinsic transmembrane protein known as sodium iodide symporter (NIS) f acilitates the active transport of iodide across the basolateral membrane of thyroid follicular cells. Iodine is an essential molecule that is used to produce the classical thyroid hormones.\nTo perform a molecular dynamic s (MD) simulation\, we used structures of apo-NIS and NIS with I− and an oxyanion (ReO4−) bound to it. \nThe goal of our computational study wa s to explore the conformational space of NIS and gain insights into the co nformations it assumes over the course of its transport cycle.\nWe prepare d a realistic simulation system that included NIS Na+ + I− / Na+ + ReO4 − complexes embedded in a central membrane with the mammalian lipid comp osition\, with two half-membrane leaflets on either side. We simulated the membrane potential by applying a constant external electrical field to th e system\, thereby bringing about the equivalent of a membrane potential. We are using this system to conduct unbiased and enhanced dynamics (metady namics\, Deep-Tica)\, a NPT statistical ensemble\, with the program GROMAC S (2023.3) and a modified CHARMM36 force-field\, to include non-bonded int eractions between I− and the oxyanion ReO4−. In order to determine the effects of the potential on the outwardly open NIS events\, simulations w ere conducted with three different membrane potentials (0\, −70\, and −140 mV) using the wild-type NIS with the anion and oxyanion bound to it \, and using a double mutant with interesting transport characteristics.\n The resulting MD trajectories are currently being analyzed using a Python 3.11 script and some public libraries such as mdtraj (v1.9)\, MDanalysi s (v2.7)\, Pyemma (v2.5.12)\, mlcolvs and pytorch for deep-learning analys is. Metadynamics calculations of the transport of I−/ReO4− free energy along the transport path are currently being done for the different membr ane potentials\, using funnel bias metadynamics.\n\nhttps://fisindico.unia ndes.edu.co/event/23/contributions/349/ LOCATION:Universidad de los Andes ML-513 URL:https://fisindico.uniandes.edu.co/event/23/contributions/349/ END:VEVENT BEGIN:VEVENT SUMMARY:Scaling limits of random curves via Schramm–Loewner evolution DTSTART;VALUE=DATE-TIME:20260417T214000Z DTEND;VALUE=DATE-TIME:20260417T220000Z DTSTAMP;VALUE=DATE-TIME:20260414T202359Z UID:indico-contribution-94-323@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Leidy Milena Leal Abril (UPTC)\nThe Schramm–Loewne r Evolution (SLE) provides a rigorous framework for characterizing the sca ling limits of fractal curves\, encoding their geometric properties throug h the diffusion parameter of a Brownian motion and enabling a universal cl assification of stochastic growth processes. In this talk\, we introduce t he basic ideas behind SLE and discuss its role in understanding conformall y invariant scaling limits of critical lattice models\, such as coastlines and invasion percolation trees. We also discuss some limitations of this description and suggest possible directions for generalizations.\n\nhttps: //fisindico.uniandes.edu.co/event/23/contributions/323/ LOCATION:Universidad de los Andes ML-513 URL:https://fisindico.uniandes.edu.co/event/23/contributions/323/ END:VEVENT BEGIN:VEVENT SUMMARY:El amplio espectro de la IA en temas estadísticos DTSTART;VALUE=DATE-TIME:20260414T212000Z DTEND;VALUE=DATE-TIME:20260414T215000Z DTSTAMP;VALUE=DATE-TIME:20260414T202359Z UID:indico-contribution-94-356@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Carlos Lemoine (Centro Nacional de Consultoría)\nh ttps://fisindico.uniandes.edu.co/event/23/contributions/356/ LOCATION:Universidad Nacional Ed. 564 URL:https://fisindico.uniandes.edu.co/event/23/contributions/356/ END:VEVENT BEGIN:VEVENT SUMMARY:From ferrimagnetic to spin glass behavior and back in lamellar Mn oxides undoped and doped with Co DTSTART;VALUE=DATE-TIME:20260416T155000Z DTEND;VALUE=DATE-TIME:20260416T161000Z DTSTAMP;VALUE=DATE-TIME:20260414T202359Z UID:indico-contribution-94-306@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Andrés Rosales Rivera (Universidad Nacional de Colo mbia\, Manizales)\nIn this work we describe magnetization measurements on lamellar Mn oxides un-doped and dope with Co. They show that the magnetic structure of this oxides system is extremely sensitivity to the (Co/Mn) ra tio. Special emphasis is given to the inverse susceptibility and the tempe rature derivative of the magnetic susceptibility. Interestingly\, the magn etic order changes from a typical ferrimagnetic one with two sublattices ( sample with Co/Mn = 0) to an unconventional ferrimagnetic one with many su blattices (sample with Co/Mn = 0.014) and\, subsequently\, to a possible s pin glass-type structure (sample with Co/Mn = 0.037)\, before finally back to a predominant typical ferrimagnetic order taking place at intermediate temperatures (sample with Co/Mn = 0.096) with increasing the (Co/Mn) rati o. The behavior of the susceptibility is described by means of its associa tion with the spatial range of correlations between the spins of the syste m. The possible mechanisms leading to such unusual changes of magnetic ord ering are discussed\, including the super exchange interaction\, double ex change interaction\, and the frustration associated to such magnetic inter actions.\n\nhttps://fisindico.uniandes.edu.co/event/23/contributions/306/ LOCATION:Universidad de los Andes ML-513 URL:https://fisindico.uniandes.edu.co/event/23/contributions/306/ END:VEVENT BEGIN:VEVENT SUMMARY:Defect-induced ferroic states in solid solutions of layered van de r Waals DTSTART;VALUE=DATE-TIME:20260416T161000Z DTEND;VALUE=DATE-TIME:20260416T163000Z DTSTAMP;VALUE=DATE-TIME:20260414T202359Z UID:indico-contribution-94-322@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Paula Giraldo Gallo (Universidad de los Andes)\nSoli d solutions of transition-metal dichalcogenides (TMDs)\, a family of cuasi -2D van der Waals materials\, provide a powerful platform to explore how c omposition\, structural symmetry\, and defect chemistry collectively deter mine electronic and ferroic properties in layered materials. In particular \, the ability to independently tune substitutional disorder and intrinsic defect populations offers a route to stabilize emergent phases that are a bsent in stoichiometric compounds. These materials therefore offer a versa tile framework to investigate how compositional engineering and defect-med iated symmetry breaking can generate new functional states.\n\nIn this tal k\, I will discuss how alloying different TMDs can be a general strategy t o control structural symmetry and electronic instabilities that give rise to multiple ferroic orders. Within this framework\, chemical substitution primarily modifies lattice parameters\, bonding geometry\, and spin–orbi t coupling\, while deviations from ideal stoichiometry introduce defect po pulations that can locally break inversion symmetry and generate magnetic moments or electric dipoles. The interplay between these two control param eters provides a pathway to stabilize magnetic\, polar\, and multiferroic states in otherwise non-ferroic layered materials.\n\nI will illustrate th ese ideas with experimental examples from the alloy families WSe2-WTe2 and WS2-WTe2\, synthesized as bulk single crystals and characterized through structural\, magnetic\, piezoresponse and transport measurements. In parti cular\, the WSe2-WTe2 system reveals a systematic evolution of lattice sym metry and unit cell volume with tellurium substitution and the emergence o f defect-stabilized magnetic and polar responses as the chalcogen vacancy density increases. By correlating substitution and defect concentration\, a configurational ferroic phase diagram can be constructed that separates paramagnetic–ferromagnetic\, paraelectric-ferroelectric\, and multiferro ic regimes. These results highlight how solid-solution engineering in laye red van der Waals materials provides a general route to stabilize emergent ferroic phases through the coupled control of composition and defects.\n\ nhttps://fisindico.uniandes.edu.co/event/23/contributions/322/ LOCATION:Universidad de los Andes ML-513 URL:https://fisindico.uniandes.edu.co/event/23/contributions/322/ END:VEVENT BEGIN:VEVENT SUMMARY:Decoherence-assisted quantum key distribution DTSTART;VALUE=DATE-TIME:20260417T201000Z DTEND;VALUE=DATE-TIME:20260417T203000Z DTSTAMP;VALUE=DATE-TIME:20260414T202359Z UID:indico-contribution-94-321@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Alejandra Valencia (Universidad de los Andes)\nIn th e development of quantum technologies\, the interaction between a quantum system and its environment\, that leads to decoherence\, is traditionally viewed as a fundamental obstacle. In Quantum Key Distribution (QKD) protoc ols like BB84\, environmental noise inevitably degrades state purity\, inc reases the Quantum Bit Error Rate (QBER)\, and ultimately compromises the security of the communication channel. \n\nIn this talk\, we challenge thi s standard paradigm by presenting a theoretical and experimental study of a controllable decoherence-assisted QKD scheme [1]. Rather than attempting to isolate the quantum system from environmental noise\, we demonstrate h ow decoherence can be actively harnessed as a tool to enhance security aga inst specific eavesdropping strategies\, such as the entangling probe atta ck.\n \nWe will discuss our method of introducing tunable decoherence to p olarization qubits by coupling them to the spatial degree of freedom of li ght. By treating the transverse \nmomentum of the light as a controllable environment\, the sender and receiver (Alice and Bob) can dynamically coor dinate and vary the induced dephasing during transmission. When incorporat ed into a modified key reconciliation stage\, this shared\, controlled dec oherence effectively limits the amount of information an eavesdropper \nca n extract.\n\nFinally\, we will share the results of our experimental impl ementation\, demonstrating that Alice and Bob can cancel out the dephasing effects to recover a low QBER of approximately 7.38%. Ultimately\, this w ork adds to the effort of a different perspective on open quantum systems: proving that system-environment interactions can be strategically managed to our advantage rather than merely mitigated. \n\n[1] Sci. Rep. 15\, 312 58 (2025).\n\nhttps://fisindico.uniandes.edu.co/event/23/contributions/321 / LOCATION:Universidad de los Andes ML-513 URL:https://fisindico.uniandes.edu.co/event/23/contributions/321/ END:VEVENT BEGIN:VEVENT SUMMARY:Entanglement and dynamical scaling laws in quantum superabsorptio n DTSTART;VALUE=DATE-TIME:20260417T193000Z DTEND;VALUE=DATE-TIME:20260417T195000Z DTSTAMP;VALUE=DATE-TIME:20260414T202359Z UID:indico-contribution-94-359@fisindico.uniandes.edu.co DESCRIPTION:Speakers: John Henry Reina (Universidad del Valle)\nIn this ta lk\, we explore the superabsorption effect in quantum batteries\, which ex ploit collective quantum resources to surpass the limits of classical ener gy storage and power delivery. We analyse N-qubit cavity-coupled quantum b atteries governed by Dicke and Tavis-Cummings models under Gaussian drivin g and open-system dynamics. Finite-size scaling laws $O(N) \\sim N^\\alpha $ demonstrate an optimal region of relaxation and dephasing in which coher ent driving stabilises entanglement entropy growth for thermodynamic obser vables (maximum energy Emax\, charging time τ\, and maximum power Pmax) a nd for qubit and cavity entanglement entropies. The Dicke model exhibits e ntropy-suppressed extensive behaviour\, while the Tavis-Cummings model ach ieves super-extensive scaling ($\\alpha_{\\text{Emax}} \\in [1.08\,1.26]$\ , $\\alpha_T \\simeq −0.49$\, $\\alpha_{\\text{Pmax}}\\in [1.57\,1.73]$) \, supported by qubit-cavity entanglement. \n\nWe demonstrate that dissipa tion can act as a stabiliser source\, yielding scaling benchmarks relevant to several experimental platforms. Our findings connect entanglement\, di ssipation-enhanced scaling laws\, and superabsorption\, outlining a pathwa y towards scalable quantum batteries that offer practical quantum advantag e.\n\nWork in collaboration with Juan D. Álvarez\n\nhttps://fisindico.un iandes.edu.co/event/23/contributions/359/ LOCATION:Universidad de los Andes ML-513 URL:https://fisindico.uniandes.edu.co/event/23/contributions/359/ END:VEVENT BEGIN:VEVENT SUMMARY:Monte Carlo modeling of asphalt surface wear under studded-tire tr affic DTSTART;VALUE=DATE-TIME:20260417T153000Z DTEND;VALUE=DATE-TIME:20260417T155000Z DTSTAMP;VALUE=DATE-TIME:20260414T202359Z UID:indico-contribution-94-307@fisindico.uniandes.edu.co DESCRIPTION:Speakers: Dayani Loaiza Monsalve (Laval University)\nThis stud y investigates the evolution of asphalt pavement surface damage caused by studded-tire traffic using a combined experimental and stochastic modeling approach. Laboratory tests on six asphalt mixtures were integrated into a Monte Carlo simulation framework that models rutting as the cumulative ef fect of random stud impacts. The model incorporates parameters describing cumulative damage\, particle detachment energy thresholds\, and material s usceptibility to wear. The simulations successfully reproduce the transiti on from an initial nonlinear damage phase to a stabilized linear rutting r egime observed experimentally. A strong linear relationship was identified between the stochastic detachment parameter\, the laboratory rutting rate \, and the abrasion resistance of the mixtures. These results confirm the model’s capacity to reproduce measurable material behavior. By linking m ixture characteristics to probabilistic descriptions of surface deteriorat ion\, the proposed framework provides a predictive tool to support the des ign of more wear-resistant pavements in cold-climate regions.\n\nhttps://f isindico.uniandes.edu.co/event/23/contributions/307/ LOCATION:Universidad de los Andes URL:https://fisindico.uniandes.edu.co/event/23/contributions/307/ END:VEVENT END:VCALENDAR