Exciton and fermion-pair condensation at non-zero temperature

被引：1

作者：

Muraviev, S. E. ^{[1
]}

Rumyantsev, O. A. ^{[1
]}

机构：

[1] Natl Res Nucl Univ, MEPhI Moscow Engn Phys Inst, Moscow, Russia

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2022年 / 34卷 / 14期

关键词：

superconductivity; high temperature superconductivity; excitonic and superconducting phase transitions; Lipkin model; phase diagram; SUPERCONDUCTIVITY;

D O I：

10.1088/1361-648X/ac4c63

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A thermodynamic study of a many-particle two-level system with the SU(2) circle times 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.

引用

页数：9