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Title: Phases of a phenomenological model of twisted bilayer graphene

In this study, we propose a lattice-scale two-band generalized Hubbard model as a caricature of the electronic structure of twisted bilayer graphene. Various possible broken-symmetry phases can arise, including a nematic phase (which is a form of orbital ferromagnet) and an orbital-triplet spin-singlet superconducting phase. Lastly, concerning the mechanism of superconductivity, we propose an analogy with superconductivity in alkali-doped C 60 in which a violation of Hund's first rule plays a central role.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1]
  1. Stanford Univ., CA (United States). Dept. of Physics
  2. Stanford Univ., CA (United States). Dept. of Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Sciences
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 7; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE
OSTI Identifier:
1475428

Dodaro, J. F., Kivelson, S. A., Schattner, Y., Sun, X. Q., and Wang, C.. Phases of a phenomenological model of twisted bilayer graphene. United States: N. p., Web. doi:10.1103/physrevb.98.075154.
Dodaro, J. F., Kivelson, S. A., Schattner, Y., Sun, X. Q., & Wang, C.. Phases of a phenomenological model of twisted bilayer graphene. United States. doi:10.1103/physrevb.98.075154.
Dodaro, J. F., Kivelson, S. A., Schattner, Y., Sun, X. Q., and Wang, C.. 2018. "Phases of a phenomenological model of twisted bilayer graphene". United States. doi:10.1103/physrevb.98.075154.
@article{osti_1475428,
title = {Phases of a phenomenological model of twisted bilayer graphene},
author = {Dodaro, J. F. and Kivelson, S. A. and Schattner, Y. and Sun, X. Q. and Wang, C.},
abstractNote = {In this study, we propose a lattice-scale two-band generalized Hubbard model as a caricature of the electronic structure of twisted bilayer graphene. Various possible broken-symmetry phases can arise, including a nematic phase (which is a form of orbital ferromagnet) and an orbital-triplet spin-singlet superconducting phase. Lastly, concerning the mechanism of superconductivity, we propose an analogy with superconductivity in alkali-doped C60 in which a violation of Hund's first rule plays a central role.},
doi = {10.1103/physrevb.98.075154},
journal = {Physical Review B},
number = 7,
volume = 98,
place = {United States},
year = {2018},
month = {8}
}

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Raman Spectrum of Graphene and Graphene Layers
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Polymorphism control of superconductivity and magnetism in Cs3C60 close to the Mott transition
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