Excited-state Quantum Phase Transitions in the Anharmonic Lipkin-Meshkov-Glick Model: Static Aspects
- Others:
- Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
- Universidad de Sevilla. Departamento de Física Aplicada III
- Ministerio de Ciencia e Innovación (MICIN). España
- European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
- Junta de Andalucía
- Ministerio de Economia, Industria y Competitividad (MINECO). España
Citation
Description
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.
Abstract
Ministerio de Ciencia e Innovación PID2019-104002GB-C21, PID2019104002GB-C22, PID2020-114687GB-I00
Abstract
European Commission. Fondo Europeo de Desarrollo Regional UHU-1262561, US-1380840
Abstract
Junta de Andalucía P20_01247
Abstract
Ministerio de Economia, Industria y Competitividad UNHU-15CE-2848
Additional details
- URL
- https://idus.us.es/handle//11441/153100
- URN
- urn:oai:idus.us.es:11441/153100
- Origin repository
- USE