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
N1 - Funding Information:
Acknowledgments We thank K. Okunishi for tutorial lectures, S. Yamamoto for enlightening discussion, C. E. Agrapidis for careful reading of our manuscript, and U. Nitzsche for technical assistance. M.K. acknowledges the hospitality of IFW Dresden during his stay in Dresden and his use of computers. This work was supported in part by Grants-in-Aid for Scientific Research from JSPS (Projects Nos. JP17K05530 and JP19K14644), by the DFG through SFB 1143 (project-id 247310070), and by Keio University Academic Development Funds for Individual Research.
Publisher Copyright:
©2020 The Physical Society of Japan
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 -