Finite-temperature properties of excitonic condensation in the extended Falicov–Kimball model: Cluster mean-field-theory approach

Masahiro Kadosawa, Satoshi Nishimoto, Koudai Sugimoto, Yukinori Ohta

Research output: Contribution to journalArticle

Abstract

We study the electron–hole pair (or excitonic) condensation in the extended Falicov–Kimball model at finite temperatures based on the cluster mean-field-theory approach, where we make the grand canonical exact-diagonalization analysis of small clusters using the sine-square deformation function. We thus calculate the ground-state and finite-temperature phase diagrams of the model, as well as its optical conductivity and single-particle spectra, thereby clarifying how the preformed pair states appear in the strong-coupling regime of excitonic insulators. We compare our results with experiments on Ta2NiSe5,.

Original languageEnglish
Article number053706
JournalJournal of the Physical Society of Japan
Volume89
Issue number5
DOIs
Publication statusPublished - 2020 May 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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