RT Journal Article
T1 Characterizing the Lipkin-Meshkov-Glick model excited state quantum phase transition using dynamical and statistical properties of the diagonal entropy
A1 Wang, Qian
A1 Pérez Bernal, Francisco
AB Using the diagonal entropy, we analyze the dynamical signatures of the Lipkin-Meshkov-Glick (LMG) model excited-state quantum phase transition (ESQPT). We first show that the time evolution of the diagonal entropy behaves as an efficient indicator of the presence of an ESQPT. We also compute the probability distribution of the diagonal entropy values over a certain time interval and we find that the resulting distribution provides a clear distinction between the different phases of ESQPT. Moreover, we observe that the probability distribution of the diagonal entropy at the ESQPT critical point has a universal form, well described by a beta distribution, and that a reliable detection of the ESQPT can be obtained from the diagonal entropy central moments. 
PB American Physical Society
SN 1539-3755
YR 2021
FD 2021-03
LK http://hdl.handle.net/10272/19853
UL http://hdl.handle.net/10272/19853
LA eng
NO Wang, Q., & Pérez Bernal, F. (2021). Characterizing the Lipkin-Meshkov-Glick model excited-state quantum phase transition using dynamical and statistical properties of the diagonal entropy. Physical Review E, 103(3). DOI: https://doi.org/10.1103/physreve.103.032109
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026