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 language | English |
|---|---|
| Article number | 197001 |
| Journal | Physical Review Letters |
| Volume | 119 |
| Issue number | 19 |
| DOIs | |
| Publication status | Published - 2017 Nov 8 |
| Externally published | Yes |
Fingerprint
ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Competition among Superconducting, Antiferromagnetic, and Charge Orders with Intervention by Phase Separation in the 2D Holstein-Hubbard Model. / Ohgoe, Takahiro; Imada, Masatoshi.
In: Physical Review Letters, Vol. 119, No. 19, 197001, 08.11.2017.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Competition among Superconducting, Antiferromagnetic, and Charge Orders with Intervention by Phase Separation in the 2D Holstein-Hubbard Model
AU - Ohgoe, Takahiro
AU - Imada, Masatoshi
PY - 2017/11/8
Y1 - 2017/11/8
N2 - 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.
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.
UR - http://www.scopus.com/inward/record.url?scp=85033572533&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85033572533&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.119.197001
DO - 10.1103/PhysRevLett.119.197001
M3 - Article
VL - 119
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 19
M1 - 197001
ER -