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Published on: March 30, 2017
Exciton and fermion-pair condensation at non-zero temperature
S E Muraviev1, O A Rumyantsev1
1National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Russia.
Abstract:
A thermodynamic study of a many-particle two-level system with theSU(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.
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