TY - JOUR
T1 - Finite-temperature properties of excitonic condensation in the extended Falicov–Kimball model
T2 - Cluster mean-field-theory approach
AU - Kadosawa, Masahiro
AU - Nishimoto, Satoshi
AU - Sugimoto, Koudai
AU - Ohta, Yukinori
PY - 2020/5/15
Y1 - 2020/5/15
N2 - 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,.
AB - 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,.
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U2 - 10.7566/JPSJ.89.053706
DO - 10.7566/JPSJ.89.053706
M3 - Article
AN - SCOPUS:85085376542
VL - 89
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 5
M1 - 053706
ER -