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Browsing by Author "Pérez Bernal, Francisco"
Now showing items 21-39 of 55
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Equilibration time in many-body quantum systems
Lezama, Talía L. M.; Torres Herrera, E. Jonathan; Pérez Bernal, Francisco
; Bar Lev, Yevgeny; Santos, Lea F. (American Physical Society, 2021)
Isolated many-body quantum systems quenched far from equilibrium can eventually equilibrate, but it is not yet clear how long they take to do so. To answer this question, we use exact numerical methods and analyze the ... -
Equivalent rotations associated with the permutation inversion group revisited: symmetry projection of the rovibrational functions of methane
Álvarez Bajo, Osiris; Lemus, R.; Carvajal Zaera, Miguel; Pérez Bernal, Francisco (Taylor & Francis, 2011)
In this work the analysis of the equivalent rotations from the permutation inversion group formalism is revisited. We emphasize that explicit knowledge of changes in the Euler angles are not required in order to determine ... -
Estudio de las reacciones inducidas por núcleos halo a energías cercanas a la barrera de Coulomb
Acosta Sánchez, Luis Armando (Universidad de Huelva, 2009)
En este trabajo se muestra el estudio de los canales de reacción que aparecen a partir de la dispersión de núcleos con halo de neutrones a una energía cercana a la barrera Coulombiana. Dicho estudio se desprende del análisis ... -
Estudio de las transiciones de fase cuánticas de estado fundamental y de estados excitados en el límite bidimensional del modelo de vibrones: aplicación al espectro de flexión molecular
(Universidad de Huelva, 2022)El estudio de la estructura molecular es muy relevante en diferentes campos de la física. En particular, se emplean métodos clásicos, semiclásicos y cuánticos para la descripción de la estructura molecular. En la presente ... -
Evidence of strong effects of the 11Be halo structure on reaction processes at energies around the Coulomb barrier
Di Pietro, A.; Amorini, F.; Fisichella, M.; Lattuada, M.; Musumarra, A.; Papa, M.; Pellegriti, M. G.; Randisi, G.; Rizzo, F.; Santonocito, D.; Scalia, G.; Scuderi, V.; Strano, E.; Torresi, D.; Acosta Sánchez, Luis Armando; Martel Bravo, Ismael; Pérez Bernal, Francisco; Borge, M. J. G.; Maira Vidal, A.; Tengblad, Olof; Fraile, L. M.; Jeppesen, H.; Voulot, D.; Wenander, F.; Gómez Camacho, Joaquín; Milin, M.; Raabe, R.; Zadro, M. (IOP Publishing, 2011)
The collision induced by the three Beryllium isotopes, 9;10;11Be, on 64Zn target were investigated at Ec:m: 1.4 the Coulomb barrier. Elastic scattering angular distributions were measured for the 9;10Be collisions ... -
Exceptional spectral phase in a dissipative collective spin model
Rubio-García, Álvaro; Relaño Pérez, Armando; Corps, Ángel L.; Molina, Rafael A.; Pérez Bernal, Francisco; García Ramos, José Enrique; Dukelsky, J. (American Physical Society, 2022)
We study a model of a quantum collective spin weakly coupled to a spin-polarized Markovian environment and find that the spectrum is divided into two regions that we name normal and exceptional Liouvillian spectral phases. ... -
Excited-state quantum phase transition and the quantum speed limit time
Wang, Qian; Pérez Bernal, Francisco (American Physical Society, 2019)
We investigate the influence of an excited-state quantum phase transition on the quantum speed limit time of an open quantum system. The system consists of a central qubit coupled to a spin environment modeled by a ... -
Excited-state quantum phase transitions in many-body systems with infinite-range interaction : localization, dynamics, and bifurcation
Santos, Lea F.; Távora, Marco; Pérez Bernal, Francisco (American Physical Society, 2016)
Excited state quantum phase transitions (ESQPTs) are generalizations of quantum phase transitions (QPTs) to excited levels. They are associated with local divergences in the density of states. Here, we investigate how the ... -
Excited-state quantum phase transitions in the anharmonic Lipkin-Meshkov-Glick model: Static aspects
Gamito, J.; Khalouf-Rivera, Jamil; Arias Carrasco, José Miguel; Pérez Fernández, Pedro; Pérez Bernal, Francisco (American Physical Society, 2022)
The basic Lipkin-Meshkov-Glick model displays a second-order ground-state quantum phase transition and an excited-state quantum phase transition (ESQPT). The inclusion of an anharmonic term in the Hamiltonian implies a ... -
Experimental study of the collision 11Be + 64Zn around the Coulomb barrier
Di Pietro, A.; Scuderi, V.; Moro, A. M.; Acosta Sánchez, Luis Armando; Amorini, F.; Borge, M. J. G.; Gómez Camacho, Joaquín; Jeppesen, H.; Lattuada, M.; Martel Bravo, Ismael; Milin, M.; Musumarra, A.; Papa, M.; Pellegriti, M. G.; Pérez Bernal, Francisco; Raabe, R.; Randisi, G.; Rizzo, F.; Scalia, G.; Tengblad, Olof; Torresi, D.; Maira Vidal, A.; Voulot, D.; Wenander, F.; Zadro, M. (American Physical Society, 2012)
In this paper details of the experimental procedure and data analysis of the collision of 11Be +64Zn around the Coulomb barrier are described and discussed in the framework of different theoretical approaches. In a previous ... -
Finite-size corrections in the bosonic algebraic approach to two-dimensional systems
Pérez Fernández, Pedro; Arias Carrasco, José Miguel; García Ramos, José Enrique; Pérez Bernal, Francisco (American Physical Society, 2011-06-30)
Analytical results beyond the mean-field-limit approximation for several observables of the two-dimensional limit of the vibron model are presented. Finite-size scaling exponent values are also analytically derived. The ... -
Identifying the order of a quantum phase transition by means of Wehrl entropy in phase space
Castaños, Octavio; Calixto, M.; Pérez Bernal, Francisco; Romera, Elvira (American Physical Society, 2015)
We propose a method to identify the order of a quantum phase transition by using area measures of the ground state in phase space. We illustrate our proposal by analyzing the well known example of the quantum cusp and four ... -
A novel connection between algebraic spectroscopic parameters and force constants in the description of vibrational excitations of linear triatomic molecules
Sánchez Castellanos, M.; Lemus, R.; Carvajal Zaera, Miguel; Pérez Bernal, Francisco (Elsevier, 2009-01)
A connection between an algebraic approach to the dynamics of triatomic molecules based on the U(2)×U(3)×U(2) Lie algebra and the traditional description in configuration space is presented. The connection is established ... -
Novel results from an algebraic approach to molecular bending dynamics
Pérez Bernal, Francisco; Álvarez Bajo, Osiris; Arias Carrasco, José Miguel; Carvajal Zaera, Miguel; García Ramos, José Enrique; Larese, Danielle; Pérez Fernández, Pedro (Institute of Physics, 2011)
We present a brief review of research topics of current interest that depend on an algebraic approach to molecular bending dynamics. This approach is based on a u(3) spectrum generating algebra. In particular, we briefly ... -
The Potential Energy Surface of CO2 from an algebraic approach
Sánchez Castellanos, M.; Lemus, R.; Carvajal Zaera, Miguel; Pérez Bernal, Francisco (Wiley-Blackwell, 2012-05)
The potential energy surface (PES) for the ground state of the 12C 16O2 molecule is estimated through an algebraic approach based on unitary groups.It is shownthat a purely algebraic approachmay lead to a unphysical ... -
Probing excited-state quantum phase transition in a quantum many body system via out-of-time-ordered correlator
Wang, Qian; Pérez Bernal, Francisco (Universidad Cornell, 2018)
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, we verify that the OTOC can also be ... -
A quantitative study of non-Condon effects in the S2O C̃→X̃ emission spectrum
Iachello, F.; Pérez Bernal, Francisco; Müller, T.; Vaccaro, P. H. (American Institute of Physics, 2000)
A novel technique has been developed for the quantitative study of vibronically-resolved transition intensities in polyatomic molecules beyond the Condon approximation. Matrix elements of coordinate-dependent transition ... -
Quantum fidelity susceptibility in excited state quantum phase transitions: Application to the bending spectra of nonrigid molecules
Khalouf-Rivera, Jamil; Carvajal Zaera, Miguel; Pérez Bernal, Francisco (SciPost Foundation, 2022-01-04)
We characterize excited state quantum phase transitions in the two dimensional limit of the vibron model with the quantum fidelity susceptibility, comparing the obtained results with the information provided by the ...
