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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:
; ; ; ; ;
Publication Date:
Grant/Contract Number:
SC0014671; 11774019; DMR-1609560; DMR-1306048; AC02-76SF00515; AC02-05CH11231
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:
Univ. of California, Davis, CA (United States); 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
OSTI Identifier:
1477011
Alternate Identifier(s):
OSTI ID: 1434186

Guo, Huaiming, Khatami, Ehsan, Wang, Yao, Devereaux, Thomas P., Singh, Rajiv R. P., and Scalettar, Richard T.. Unconventional pairing symmetry of interacting Dirac fermions on a π -flux lattice. United States: N. p., Web. doi:10.1103/PhysRevB.97.155146.
Guo, Huaiming, Khatami, Ehsan, Wang, Yao, Devereaux, Thomas P., Singh, Rajiv R. P., & Scalettar, Richard T.. Unconventional pairing symmetry of interacting Dirac fermions on a π -flux lattice. United States. doi:10.1103/PhysRevB.97.155146.
Guo, Huaiming, Khatami, Ehsan, Wang, Yao, Devereaux, Thomas P., Singh, Rajiv R. P., and Scalettar, Richard T.. 2018. "Unconventional pairing symmetry of interacting Dirac fermions on a π -flux lattice". United States. doi:10.1103/PhysRevB.97.155146.
@article{osti_1477011,
title = {Unconventional pairing symmetry of interacting Dirac fermions on a π -flux lattice},
author = {Guo, Huaiming and Khatami, Ehsan and Wang, Yao and Devereaux, Thomas P. and Singh, Rajiv R. P. and Scalettar, Richard T.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.97.155146},
journal = {Physical Review B},
number = 15,
volume = 97,
place = {United States},
year = {2018},
month = {4}
}

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