@misc{10481/78499,
year = {2022},
month = {10},
url = {https://hdl.handle.net/10481/78499},
abstract = {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 second ESQPT of a different nature. We characterize this ESQPT using the mean field limit of the
model. The alternative ESQPT, associated with the changes in the boundary of the finite Hilbert space of
the system, can be properly described using the order parameter of the ground-state quantum phase transition,
the energy gap between adjacent states, the participation ratio, and the quantum fidelity susceptibility.},
organization = {I + D + i Projects - MCIN/AEI	PID2019-104002GB-C21	
PID2019104002GB-C22	
PID2020-114687GB-I00	
MCIN/AEI/10.13039/501100011033},
organization = {Junta de Andalucia},
organization = {European Commission	UHU-1262561	
US-1380840},
organization = {Junta de Andalucia	P20_01247},
organization = {ERDF-A Way of Making Europe		
European Commission},
organization = {Spanish Government	UNHU-15CE-2848},
organization = {European Union NextGenerationEU/PRTR},
publisher = {American Physical Society},
title = {Excited-state quantum phase transitions in the anharmonic Lipkin-Meshkov-Glick model: Static aspects},
doi = {10.1103/PhysRevE.106.044125},
author = {Gamito, J. and Arias, J. M. and Pérez Fernández, P. and Pérez Bernal, Francisco},
}