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.

arXiv comment7 pages, 5 figures

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Cited by in corpus (14)

• Strong Coupling Nature of the Excitonic Insulator State in Ta${}_2$NiSe${}_5$
• Photo-induced enhancement of excitonic order
• Exciton-phonon cooperative mechanism of the triple-$q$ charge-density-wave and antiferroelectric electron polarization in TiSe${}_2$
• Orthorhombic-to-monoclinic transition in Ta${}_2$NiSe${}_5$ due to a zone-center optical phonon instability
• A New Era of Excitonic Insulators
• Excitonic Insulator State of the Extended Falicov-Kimball Model in the Cluster Dynamical Impurity Approximation
• Effects of Disorder on the Transport of Collective Modes in an Excitonic Condensate
• Excitonic Phase Diagram of the Three-Chain Hubbard Model for Semiconducting and Semimetallic Ta${}_2$NiSe${}_5$
• Excitonic condensation reflecting electronic states in two-band Penrose-Hubbard model
• Finite-temperature properties of excitonic condensation in the extended Falicov-Kimball model: Cluster mean-field-theory approach
• Spin texture and spin current in excitonic phases of the two-band Hubbard model
• FFLO Superconductivity Mediated by Excitonic Fluctuation in Semimetallic Ta${}_2$NiSe${}_5$
• Experimental realization of Majorana hinge and corner modes in intrinsic organic topological superconductor without magnetic field at room temperature
• Photoinduced dynamics of excitonic order and Rabi oscillation in the two-orbital Hubbard model