A5048075140- Quantum, superfluid, helium dynamics
- Quantum Information and Cryptography
- Quantum chaos and dynamical systems
- Quantum many-body systems
- Spectroscopy and Quantum Chemical Studies
- Cold Atom Physics and Bose-Einstein Condensates
Universidad de Sevilla
2022-2023
The basic Lipkin-Meshkov-Glick model displays a second-order ground-state quantum phase transition and an excited-state (ESQPT). inclusion of anharmonic term in the Hamiltonian implies second ESQPT different nature. We characterize this using mean field limit model. alternative ESQPT, associated with changes boundary finite Hilbert space system, can be properly described order parameter transition, energy gap between adjacent states, participation ratio, fidelity susceptibility.
The standard Lipkin-Meshkov-Glick (LMG) model undergoes a second-order ground-state quantum phase transition (QPT) and an excited-state (ESQPT). inclusion of anharmonic term in the LMG Hamiltonian gives rise to second ESQPT that alters static properties [Gamito , Phys. Rev. E 106, 044125 (2022)]. In present work, dynamical implications associated this new are analyzed. For purpose, quench protocol is defined on system takes initial state, usually ground into complex excited state evolves...