A variational Monte Carlo study of exciton condensation

Hiroshi Watanabe, Kazuhiro Seki, Seiji Yunoki

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Exciton condensation in a two-band Hubbard model on a square lattice is studied with variational Monte Carlo method. We show that the phase transition from an excitonic insulator to a band insulator is induced by increasing the interband Coulomb interaction. To examine the character of the exciton condensation, the exciton pair amplitudes both in k-space and in real space are calculated. Using these quantities, we discuss the BCS-BEC crossover within the excitonic insulator phase.

Original languageEnglish
Article number012097
JournalJournal of Physics: Conference Series
Volume592
Issue number1
DOIs
Publication statusPublished - 2014
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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