Browsing by Author "0000000194002709"
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Analytical description of the survival probability of coherent states in regular regimes.
LermaHernandez, Sergio; ChavezCarlos, Jorge; BastarracheaMagnani, Miguel A.; Santos, Lea F.; Hirsch, Jorge G. (American Physical Society, 2018)Using coherent states as initial states, we investigate the quantum dynamics of the Lipkin–Meshkov–Glick (LMG) and Dicke models in the semiclassical limit. They are representative models of bounded systems with one and ... 
Calculation of transition state energies in the hcn–hnc isomerization with an algebraic model.
KhaloufRivera, Jamil; Carvajal, Miguel; PérezBernal, Francisco; Santos, Lea F. (American Chemical Society, 20191009)Recent works have shown that the spectroscopic access to highly excited states provides enough information to characterize transition states in isomerization reactions. Here, we show that information about the transition ... 
Chaos enhancement in largespin chains
Santos, Lea F.; Lebel, Yael; Bar Lev, Yevgeny (arXiv preprints, 20220331)We study the chaotic properties of a largespin XXZ chain with onsite disorder and a small number of excitations above the fully polarized state. We show that while the classical limit, which is reached for large spins, ... 
Comment on “Systematic Construction of Counterexamples to the Eigenstate Thermalization Hypothesis”.
Mondaini, Rubem; Krishnanand, Mallayya; Santos, Lea F.; Rigol, Marcos (American Physical Society, 20180717) 
Decay of a thermofielddouble state in chaotic quantum systems.
del Campo, A.; MolinaVilaplana, J.; Santos, Lea F.; Sonner, J. (EDP Sciences, 201809)Scrambling in interacting quantum systems out of equilibrium is particularly effective in the chaotic regime. Under time evolution, initially localized information is said to be scrambled as it spreads throughout the entire ... 
Dynamical signatures of quantum chaos and relaxation time scales in a spinboson system.
Santos, Lea F.; BastarracheaMagnani, M. A.; LermaHernández, S.; TorresHerrera, E.J.; Hirsch, J.G.; Villaseñor, D. (American Physical Society, 20190731)Quantum systems whose classical counterparts are chaotic typically have highly correlated eigenvalues and level statistics that coincide with those from ensembles of full random matrices. A dynamical manifestation of these ... 
Dynamical signatures of quantum chaos and relaxation timescales in a spinboson system.
LermaHernández, S.; Villaseñor, D.; BastarracheaMagnani, M. A.; TorresHerrera, E.J.; Santos, Lea F.; Hirsch, J.G. (Philip Allan Publishers Limited, 20190510)Quantum systems whose classical counterparts are chaotic typically have highly correlated eigenvalues and level statistics that coincide with those from ensembles of full random matrices. A dynamical manifestation of these ... 
Dynamics at the manybody localization transition.
TorresHerrera, E.J.; Santos, Lea F. (American Physical Society, 201507)The isolated onedimensional Heisenberg model with static random magnetic fields has become paradigmatic for the analysis of manybody localization. Here, we study the dynamics of this system initially prepared in a ... 
Entanglement in quantum computers described by the XXZ model with defects.
Santos, Lea F. (American Physical Society, 200306)We investigate on how to generate maximally entangled states in systems characterized by the Hamiltonian of the XXZ model with defects. Some proposed quantum computers are described by such a model. Defects embedded in ... 
Entropy of Isolated Quantum Systems after a Quench.
Santos, Lea F.; Rigol, Marcos; Polkovnikov, Anatoli (American Physical Society, 20110718)A diagonal entropy, which depends only on the diagonal elements of the system’s density matrix in the energy representation, has been recently introduced as the proper definition of thermodynamic entropy in outofequilibrium ... 
Excitedstate quantum phase transitions studied from a nonHermitian perspective.
Sindelka, Milan; Santos, Lea F.; Moiseyev, Nimrod (American Physical Society, 20170124)A main distinguishing feature of nonHermitian quantum mechanics is the presence of exceptional points (EPs). They correspond to the coalescence of two energy levels and their respective eigenvectors. Here, we use the ... 
Experimental Detection of the Correlation R ́enyi Entropy in the Central Spin Model.
Santos, Lea F.; Niknam, Mohamad; Cory, David G. (202011)We propose and experimentally measure an entropy that quantifies the volume of correlations among qubits.The experiment is carried out on a nearly isolated quantum system composed of a central spin coupled and initially ... 
Exponentially fast dynamics in the Fock space of chaotic man ybody systems.
Borgonovi, F.; Izrailev, F.M.; Santos, Lea F. (arXiv.org, 20180222)We demonstrate analytically and numerically that in isolated quantum systems of many interacting particles, the number of states participating in the evolution after a quench increases exponentially in time, provided the ... 
Exponentially fast dynamics of chaotic manybody systems.
Borgonovi, F.; Izrailev, F.M.; Santos, Lea F. (American Physical Society, 20190102)We demonstrate analytically and numerically that in isolated quantum systems of many interacting particles, the number of manybody states participating in the evolution after a quench increases exponentially in time, ... 
From few to manybody quantum systems.
Schiulaz, Mauro; Tavora, Marco; Santos, Lea F. (IOP Publishing, 20180903)How many particles are necessary to make a quantum system manybody? To answer this question, we take as reference for the manybody limit a quantum system at halffilling and compare its properties with those of a system ... 
Generic dynamical features of quenched interacting quantum systems: Survival probability, density imbalance, and outoftimeordered correlator.
TorresHerrera, E.J.; GarciaGarcia, Antonio M.; Santos, Lea F. (American Physical Society, 20180223)We study numerically and analytically the quench dynamics of isolated manybody quantum systems. Using full random matrices from the Gaussian orthogonal ensemble, we obtain analytical expressions for the evolution of the ... 
Groundstate energy distribution of disordered manybody quantum systems
Buijsman, Wouter; Lezama, Talía L. M.; Leiser, Tamar; Santos, Lea F. (arXiv preprints, 20220519)Extremevalue distributions are studied in the context of a broad range of problems, from the equilibrium properties of lowtemperature disordered systems to the occurrence of natural disasters. Our focus here is on the ... 
Heating suppression by longrange interactions in periodically driven spin chains.
Santos, Lea F.; Bhakuni, Devendra Singh; Bar Lev, Yevgeny (arXiv preprint, 20210520)We propose a mechanism to suppress heating in periodically driven manybody quantum systems by employing sufficiently longrange interactions and experimentally relevant initial conditions. The mechanism is robust to local ... 
How many particles make up a chaotic manybody quantum system?
Santos, Lea F.; Zisling, Guy; Bar Lev, Yevgeny (arXiv preprint arXiv:2012.14436, 20201228)We numerically investigate the minimum number of interacting particles, which is required for the onset of strong chaos in quantum systems on a onedimensional lattice with shortrange and longrange interactions. We ... 
Identification of quantum scars via phasespace localization measures
Santos, Lea F.; PilatowskyCameo, Sa ́ul; Villase ̃nor, David; BastarracheaMagnan, Miguel A.; LermaHern ́andez, Sergio; Hirsch, Jorge G. (arXiv preprint, 20210714)There is no unique way to quantify the degree of delocalization of quantum states in unbounded continuous spaces. In this work, we explore a recently introduced localization measure that quantifies the portion of the ...