96 citations · 418 across the 9 of their papers we have counts for
9 papers
Signatures of excited state quantum phase transitions in quantum many body systems: Phase space analysis
Qian Wang, Francisco Pérez-Bernal
Using the Husimi function, we investigate the phase space signatures of the excited state quantum phase transitions (ESQPTs) in the Lipkin and coupled top models. We show that the…
Excited state quantum phase transitions in the bending spectra of molecules
Jamil Khalouf-Rivera, Francisco Pérez-Bernal, Miguel Carvajal
We present an extension of the Hamiltonian of the two dimensional limit of the vibron model encompassing all possible interactions up to four-body operators. We apply this Hamilton…
Speck of Chaos
Lea F. Santos, Francisco Pérez-Bernal, E. Jonathan Torres-Herrera
It has been shown that, despite being local, a perturbation applied to a single site of the one-dimensional XXZ model is enough to bring this interacting integrable spin-1/2 system…
An overview of the scientific contribution of Andrea Vitturi to Nuclear Physics (being an account of the recent TNP19 meeting held in Padova)
L. Fortunato, C. E. Alonso, J. M. Arias +8
We give an account of the main achievements of the scientific career of Andrea Vitturi so far, that have recently been discussed during the workshop "Theoretical Nuclear Physics in…
Self-averaging in many-body quantum systems out of equilibrium. II. Approach to the localized phase
E. Jonathan Torres-Herrera, Giuseppe De Tomasi, Mauro Schiulaz +2
The self-averaging behavior of interacting many-body quantum systems has been mostly studied at equilibrium. The present work addresses what happens out of equilibrium, as the incr…
Probing excited-state quantum phase transition in a quantum many body system via out-of-time-ordered correlator
Qian Wang, Francisco Pérez-Bernal
As a measure of information scrambling and quantum chaos, out-of-time-ordered correlator (OTOC) plays more and more important role in many different fields of physics. In this work…
Effects of excited state quantum phase transitions on system dynamics
Francisco Pérez-Bernal, Lea F. Santos
This work is concerned with the excited state quantum phase transitions (ESQPTs) defined in Ann.Phys. 323, 1106 (2008). In many-body models that exhibit such transitions, the groun…
Excited-state quantum phase transitions in many-body systems with infinite-range interaction: Localization, dynamics, and bifurcation
Lea F. Santos, Marco Távora, Francisco Pérez-Bernal
Excited state quantum phase transitions (ESQPTs) are generalizations of quantum phase transitions (QPTs) to excited levels. They are associated with local divergences in the densit…
Structure of eigenstates and quench dynamics at an excited state quantum phase transition
Lea F. Santos, Francisco Pérez-Bernal
We study the structure of the eigenstates and the dynamics of a system that undergoes an excited state quantum phase transition (ESQPT). The analysis is performed for two-level pai…