Exciton and fermion-pair condensation at non-zero temperature.
| Autor: | Muraviev SE; National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Russia., Rumyantsev OA; National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Russia. |
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| Jazyk: | angličtina |
| Zdroj: | Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2022 Feb 03; Vol. 34 (14). Date of Electronic Publication: 2022 Feb 03. |
| DOI: | 10.1088/1361-648X/ac4c63 |
| Abstrakt: | A thermodynamic study of a many-particle two-level system with the SU (2) ⊗ SU (2)-symmetry interaction in the particle-particle and particle-hole channels is carried out. Using the symmetry of the system, its free energy and phase diagram are calculated. It is demonstrated that the superconducting (particle-particle) and excitonic (particle-hole) condensates are both formed in the considered system which undergoes two phase transitions. The calculated phase diagram represents qualitatively the phase diagram typical for materials with the high-temperature superconducting properties, including the existence of two phase transitions, the first and second order phase transitions, triple and tricritical points. (© 2022 IOP Publishing Ltd.) |
| Databáze: | MEDLINE |
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