Theory of Orbital Susceptibility on Excitonic Insulator

Abstract

We study the temperature dependence of the orbital susceptibility of an excitonic insulator on the basis of a two-band model. It is shown that a drastic change (an anomalous enhancement) in susceptibility as a function of temperature occurs owing to the occurrence of additional orbital susceptibility due to the excitonic gap. We calculate explicitly the temperature dependence of orbital susceptibility for a model of Ta${}_2$NiSe${}_5$, and show that the result is consistent with experimental results.

arXiv comment5 pages, 6 figures, Accepted for publication in J. Phys. Soc. Jpn

References in corpus (8)

• Orthorhombic-to-Monoclinic Phase Transition of Ta2NiSe5 Induced by the Bose-Einstein Condensation of Excitons
• Excitonic Bose-Einstein condensation in Ta2NiSe5 above room temperature
• Orbital Magnetism of Bloch Electrons I. General Formula
• Competition between excitonic charge and spin density waves: Influence of electron-phonon and Hund's rule couplings
• Microscopic quantum interference in excitonic condensation of Ta${}_2$NiSe${}_5$
• FFLO Excitonic State in the Three-Chain Hubbard Model for Ta${}_2$NiSe${}_5$
• Orbital Magnetism of Bloch Electrons II. Application to Single-Band Models and Corrections to Landau-Peierls susceptibility
• Theory of Orbital Susceptibility in the Tight-Binding Model: Corrections to the Peierls Phase

Cited by in corpus (8)

• 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
• Excitonic Phase Diagram of the Three-Chain Hubbard Model for Semiconducting and Semimetallic Ta${}_2$NiSe${}_5$
• Theory of Thermal Conductivity on Excitonic Insulator
• Photoinduced dynamics of excitonic order and Rabi oscillation in the two-orbital Hubbard model
• Symmetry breaking states in the half-filled two-orbital Hubbard model with crystalline electric field