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Title: Unconventional pairing symmetry of interacting Dirac fermions on a π -flux lattice

The pairing symmetry of interacting Dirac fermions on the π-flux lattice is studied with the determinant quantum Monte Carlo and numerical linked-cluster expansion methods. The s*- (i.e., extended s-) and d-wave pairing symmetries, which are distinct in the conventional square lattice, are degenerate under the Landau gauge. We demonstrate that the dominant pairing channel at strong interactions is an unconventional ds*-wave phase consisting of alternating stripes of s*- and d-wave phases. A complementary mean-field analysis shows that while the s*- and d-wave symmetries individually have nodes in the energy spectrum, the ds* channel is fully gapped. The results represent a new realization of pairing in Dirac systems, connected to the problem of chiral d-wave pairing on the honeycomb lattice, which might be more readily accessed by cold-atom experiments.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [5]
  1. Beihang Univ., Beijing (China). Dept. of Physics and Key Lab. of Micro-Nano Measurement-Manipulation and Physics; Univ. of California, Davis, CA (United States). Dept. of Physics
  2. San Jose State Univ., San Jose, CA (United States). Dept. of Physics and Astronomy
  3. Stanford Univ., CA (United States). Dept. of Applied Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Harvard Univ., Cambridge, MA (United States). Dept. of Physics
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES), Geballe Lab. for Advanced Materials and Dept. of Physics and Applied Physics
  5. Univ. of California, Davis, CA (United States). Dept. of Physics
Publication Date:
Grant/Contract Number:
11774019; DMR-1609560; DMR-1306048; AC02-76SF00515; AC02-05CH11231; SC0014671
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 15; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org:
USDOE Office of Science (SC); China Scholarship Council (CSC); Natural National Science Foundation of China (NSFC); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; impurities in superconductors; pairing mechanisms; superconducting gap; superconducting order parameter; d-wave; high-temperature superconductors; Hubbard model; Monte Carlo methods
OSTI Identifier:
1438549