Effective model of one-dimensional extended Hubbard systems: Application to linear optical spectrum calculations in large systems based on many-body Wannier functions

S. Ohmura, A. Takahashi, K. Iwano, T. Yamaguchi, K. Shinjo, T. Tohyama, S. Sota, H. Okamoto

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

We propose an effective model called the "charge model," for the half-filled one-dimensional Hubbard and extended Hubbard models. In this model, spin-charge separation, which has been justified from an infinite on-site repulsion (U) in the strict sense, is compatible with charge fluctuations. Our analyses based on the many-body Wannier functions succeeded in determining the optical conductivity spectra in large systems. The obtained spectra reproduce the spectra for the original models well even in the intermediate U region of U=5-10T, with T being the nearest-neighbor electron hopping energy. These results indicate that the spin-charge separation works fairly well in this intermediate U region against the usual expectation and that the charge model is an effective model that applies to actual quasi-one-dimensional materials classified as strongly correlated electron systems.

Original languageEnglish
Article number235134
JournalPhysical Review B
Volume100
Issue number23
DOIs
Publication statusPublished - 23 Dec 2019

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