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,...
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January 9, 2024 (v1)PublicationExcited-state Quantum Phase Transitions in the Anharmonic Lipkin-Meshkov-Glick Model: Static AspectsUploaded on: January 12, 2024
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January 9, 2024 (v1)Publication
The standard Lipkin-Meshkov-Glick (LMG) model undergoes a second-order ground-state quantum phase transition (QPT) and an excited-state quantum phase transition (ESQPT). The inclusion of an anharmonic term in the LMG Hamiltonian gives rise to a second ESQPT that alters the static properties of the model [Gamito, Phys. Rev. E 106, 044125...
Uploaded on: January 12, 2024