Enhanced correlations and superconductivity in weakly interacting partially flat-band systems: A determinantal quantum Monte Carlo study
Abstract
Motivated by recent experiments realizing correlated phenomena and superconductivity in two-dimensional (2D) van der Waals devices, we consider the general problem of whether correlation effects may be enhanced by modifying band structure while keeping a fixed weak interaction strength. Using determinantal quantum Monte Carlo, we study the 2D Hubbard model for two different band structures: a regular nearest-neighbor tight-binding model and a partially flat-band structure containing a nondispersing region, with identical total noninteracting bandwidth Wtot. For both repulsive and attractive weak interactions (|U| $$\ll$$ W$$_{tot}$$, correlated phenomena are significantly stronger in the partially flat model. In the repulsive case, even with $$U$$ being an order of magnitude smaller than W$$_{tot}$$, we find the presence of a Mott insulating state near half filling of the flat region in momentum space. In the attractive case, where generically the ground state is superconducting, the partially flat model exhibits significantly enhanced superconducting transition temperatures. These results suggest the possibility of engineering correlation effects in materials by tuning the noninteracting electronic dispersion.
- Authors:
-
- Stanford Univ., CA (United States). Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
- Pasargad Inst. for Advanced Innovative Solutions, Tehran (Iran); Washington Univ., St. Louis, MO (United States). Dept. of Physics
- Washington Univ., St. Louis, MO (United States). Dept. of Physics
- Stanford Univ., CA (United States). Dept. of Physics; Stanford Univ., CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1546747
- Alternate Identifier(s):
- OSTI ID: 1546233
- Grant/Contract Number:
- AC02-76SF00515; NSF 1411229
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 99; Journal Issue: 23; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Huang, Edwin W., Vaezi, Mohammad-Sadegh, Nussinov, Zohar, and Vaezi, Abolhassan. Enhanced correlations and superconductivity in weakly interacting partially flat-band systems: A determinantal quantum Monte Carlo study. United States: N. p., 2019.
Web. doi:10.1103/physrevb.99.235128.
Huang, Edwin W., Vaezi, Mohammad-Sadegh, Nussinov, Zohar, & Vaezi, Abolhassan. Enhanced correlations and superconductivity in weakly interacting partially flat-band systems: A determinantal quantum Monte Carlo study. United States. https://doi.org/10.1103/physrevb.99.235128
Huang, Edwin W., Vaezi, Mohammad-Sadegh, Nussinov, Zohar, and Vaezi, Abolhassan. Thu .
"Enhanced correlations and superconductivity in weakly interacting partially flat-band systems: A determinantal quantum Monte Carlo study". United States. https://doi.org/10.1103/physrevb.99.235128. https://www.osti.gov/servlets/purl/1546747.
@article{osti_1546747,
title = {Enhanced correlations and superconductivity in weakly interacting partially flat-band systems: A determinantal quantum Monte Carlo study},
author = {Huang, Edwin W. and Vaezi, Mohammad-Sadegh and Nussinov, Zohar and Vaezi, Abolhassan},
abstractNote = {Motivated by recent experiments realizing correlated phenomena and superconductivity in two-dimensional (2D) van der Waals devices, we consider the general problem of whether correlation effects may be enhanced by modifying band structure while keeping a fixed weak interaction strength. Using determinantal quantum Monte Carlo, we study the 2D Hubbard model for two different band structures: a regular nearest-neighbor tight-binding model and a partially flat-band structure containing a nondispersing region, with identical total noninteracting bandwidth Wtot. For both repulsive and attractive weak interactions (|U| $\ll$ W$_{tot}$, correlated phenomena are significantly stronger in the partially flat model. In the repulsive case, even with $U$ being an order of magnitude smaller than W$_{tot}$, we find the presence of a Mott insulating state near half filling of the flat region in momentum space. In the attractive case, where generically the ground state is superconducting, the partially flat model exhibits significantly enhanced superconducting transition temperatures. These results suggest the possibility of engineering correlation effects in materials by tuning the noninteracting electronic dispersion.},
doi = {10.1103/physrevb.99.235128},
journal = {Physical Review B},
number = 23,
volume = 99,
place = {United States},
year = {Thu Jun 13 00:00:00 EDT 2019},
month = {Thu Jun 13 00:00:00 EDT 2019}
}
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Works referencing / citing this record:
Magnetization, -wave superconductivity, and non-Fermi-liquid behavior in a crossover from dispersive to flat bands
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