Schmid, Harald and Dieplinger, Johannes and Solfanelli, Andrea and Succi, Sauro and Ruffo, Stefano (2022) Tricritical point in the quantum Hamiltonian mean-field model. PHYSICAL REVIEW E, 106 (2): 024109. ISSN 2470-0045, 2470-0053
Full text not available from this repository.Abstract
Engineering long-range interactions in experimental platforms has been achieved with great success in a large variety of quantum systems in recent years. Inspired by this progress, we propose a generalization of the classical Hamiltonian mean-field model to fermionic particles. We study the phase diagram and ther-modynamic properties of the model in the canonical ensemble for ferromagnetic interactions as a function of temperature and hopping. At zero temperature, small charge fluctuations drive the many-body system through a first-order quantum phase transition from an ordered to a disordered phase. At higher temperatures, the fluctuation-induced phase transition remains first order initially and switches to second-order only at a tricritical point. Our results offer an intriguing example of tricriticality in a quantum system with long-range couplings, which bears direct experimental relevance. The analysis is performed by exact diagonalization and mean-field theory.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GAS |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 20 Feb 2024 08:48 |
| Last Modified: | 20 Feb 2024 08:48 |
| URI: | https://pred.uni-regensburg.de/id/eprint/58215 |
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