Excited-state quantum phase transitions in the anharmonic Lipkin-Meshkov-Glick model: Static aspects

Gamito J. Khalouf-Rivera J. Arias J.M. Pérez-Fernández P. Pérez-Bernal F.
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
Doi 10.1103/PhysRevE.106.044125
Volumen 106
Citas: 4
© 2022 American Physical Society.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.
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