Orbital diamagnetic susceptibility in excitonic condensation phase

Abstract

We study the orbital diamagnetic susceptibility in excitonic condensation phase using the meanfield approximation for a two-band model defined on a square lattice. We find that, in semiconductors, the excitonic condensation acquires a finite diamagnetic susceptibility due to spontaneous hybridization between the valence and the conduction bands, whereas in semimetals, the diamagnetic susceptibility in the normal phase is suppressed by the excitonic condensation. We also study the orbital diamagnetic and Pauli paramagnetic susceptibilities of Ta2NiSe5 using a two-dimensional three-band model and find that the calculated temperature dependence of the magnetic susceptibility is in qualitative agreement with experiment.

7 pages, 5 figures

References in corpus (5)

• Evidence for an excitonic insulator phase in 1T-TiSe${}_2$
• Orbital diamagnetism in multilayer graphenes: Systematic study with the effective mass approximation
• Excitonic Bose-Einstein condensation in Ta2NiSe5 above room temperature
• On the possibility of an excitonic insulator at the semiconductor-semimetal transition
• Orbital magnetism of coupled bands models

Cited by in corpus (4)

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• Excitonic Insulator State of the Extended Falicov-Kimball Model in the Cluster Dynamical Impurity Approximation
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• Experimental realization of Majorana hinge and corner modes in intrinsic organic topological superconductor without magnetic field at room temperature