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
N1 - Funding Information:
We thank Kota Ido for useful discussions. T. O. also thanks Yuta Murakami for discussions. The code was developed based on the open-source software m vmc . This work is financially supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) High Performance Computing Infrastructure (HPCI) Strategic Programs for Innovative Research (SPIRE), the Computational Materials Science Initiative (CMSI), and Creation of New Functional Devices and High-Performance Materials to Support Next Generation Industries (CDMSI). This work was also supported by a Grant-in-Aid for Scientific Research (Grants No. 22104010, No. 22340090, and No. 16H06345) from MEXT, Japan. The simulations were partially performed on the K computer provided by the RIKEN Advanced Institute for Computational Science under the HPCI System Research project (Projects No. hp130007, No. hp140215, No. hp150211, No. hp160201, and No. hp170263). The simulations were also performed on computers at the Supercomputer Center, Institute for Solid State Physics, University of Tokyo.
Publisher Copyright:
© 2017 American Physical Society.
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.
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U2 - 10.1103/PhysRevLett.119.197001
DO - 10.1103/PhysRevLett.119.197001
M3 - Article
C2 - 29219494
AN - SCOPUS:85033572533
VL - 119
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 19
M1 - 197001
ER -