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Theory of Orbital Susceptibility on Excitonic Insulator

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arxiv 1607.07930 v1 pith:QCDOR7T2 submitted 2016-07-27 cond-mat.str-el cond-mat.mtrl-sci

Hiroyasu Matsuura , Masao Ogata This is my paper · ORCID
classification cond-mat.str-elcond-mat.mtrl-sci
keywords susceptibilityorbitalexcitonictemperaturedependenceinsulatormodeladditional
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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.

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