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

Takahiro Ohgoe, Masatoshi Imada

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number197001
JournalPhysical Review Letters
Volume119
Issue number19
DOIs
Publication statusPublished - 2017 Nov 8
Externally publishedYes

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electrons
electron phonon interactions
borders
Monte Carlo method
superconductivity
insulators
ground state

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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AB - 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.

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