Competition among Superconducting, Antiferromagnetic, and Charge Orders with Intervention by Phase Separation in the 2D Holstein-Hubbard Model

Takahiro Ohgoe, Masatoshi Imada

研究成果: Article査読

15 被引用数 (Scopus)

抄録

Using a variational Monte Carlo method, we study the competition of strong electron-electron and electron-phonon interactions in the ground state of the Holstein-Hubbard model on a square lattice. At half filling, an extended intermediate metallic or weakly superconducting (SC) phase emerges, sandwiched between antiferromagnetic and charge order (CO) insulating phases. By carrier doping into the CO insulator, the SC order dramatically increases for strong electron-phonon couplings, but is largely hampered by wide phase separation (PS) regions. Superconductivity is optimized at the border to the PS.

本文言語English
論文番号197001
ジャーナルPhysical Review Letters
119
19
DOI
出版ステータスPublished - 2017 11 8

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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