Phases of a phenomenological model of twisted bilayer graphene
By J. Dodaro, Steven A. Kivelson, Y. Schattner, Xiao-Qi Sun, Chao Wang. Physical review B, 2018
216 citations recorded by the source corpus.
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. 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.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/a137b945ac5d499b66651fe0882a0e49af7201a0
How researchers see this paper
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In Atomic and Molecular Physics, and Optics
- Ashvin Vishwanath
- Bogdan Andrei Bernevig
- H. Po
- Takashi Taniguchi
- Kenji Watanabe
- T. Senthil
- Liang Fu
- Zhida Song
In Materials Chemistry
- Ashvin Vishwanath
- Takashi Taniguchi
- Kenji Watanabe
- Bogdan Andrei Bernevig
- T. Senthil
- H. Po
- Zhida Song
- Liujun Zou
Citations in the corpus
- Unconventional Superconductivity and Density Waves in Twisted Bilayer Graphene (2018, background): “Since typical phonon energy in graphene is much larger than the miniband width, it is reasonable to integrate out the phonons to obtain phonon-mediated electron-electron attraction [10], which renormalizes the values of coupling constants.”
- Band structure of twisted bilayer graphene: Emergent symmetries, commensurate approximants, and Wannier obstructions (2018, background): “In the recent theoretical literature, some authors have proposed describing the system by a triangular lattice tight-binding model with 2 spins and 2 orbitals (presumably corresponding to the 2 valleys) per lattice site [4, 8, 12, 29].”
- Symmetry-broken Chern insulators and Rashba-like Landau-level crossings in magic-angle bilayer graphene (2020, background): “1° (MATBG), ultra-flat moiré bands (1-6) host strongly interacting electrons which give rise to a plethora of phases including correlated insulators (CI)(1, 7-10), superconductors (SC)(2, 7, 11-21) and orbital magnets (OM)(7, 22-24).”