Corpus ID: 235694232

Mechanism of skyrmion condensation and pairing for twisted bi-layer graphene

@inproceedings{Jing2021MechanismOS,
  title={Mechanism of skyrmion condensation and pairing for twisted bi-layer graphene},
  author={Dianying Jing and A. Tyner and P. Goswami},
  year={2021}
}
Dian Jing, Alexander Conkey Tyner, Pallab Goswami 1 Department of Physics and Astronomy, Northwestern University, Evanston, IL 60208 2 Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL 60208 3 Integrated Science Program, Northwestern University, Evanston, IL 60208 and 4 Graduate Program in Applied Physics, Northwestern University, Evanston, IL 60208 (Dated: July 2, 2021) 

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SHOWING 1-10 OF 57 REFERENCES
Zero modes and charged Skyrmions in graphene bilayer.
We show that the electric charge of the Skyrmion in the vector order parameters that characterize the quantum anomalous spin Hall state and the layer antiferromagnet in a graphene bilayer is four andExpand
Skyrmions with quadratic band touching fermions: A way to achieve charge 4e superconductivity
We study Skyrmion quantum numbers, charge and statistics, in (2+1) dimension induced by quadratic band toucing(QBT) fermions. It is shown that induced charge of Skyrmions is twice bigger thanExpand
Strong Coupling Phases of Partially Filled Twisted Bilayer Graphene Narrow Bands.
TLDR
This work identifies states favored by Coulomb interactions projected onto the Wannier basis of the four narrow bands of the "magic angle" twisted bilayer graphene, and finds extended excited states, the gap to which decreases in the magnetic field. Expand
Landau level degeneracy in twisted bilayer graphene: Role of symmetry breaking
The degeneracy of Landau levels flanking charge neutrality in twisted bilayer graphene is known to change from eight-fold to four-fold when the twist angle is reduced to values near the magic angleExpand
Twisted Bilayer Graphene: A Phonon-Driven Superconductor.
TLDR
It is shown that phonon-mediated electron attraction at the magic angle is strong enough to induce a conventional intervalley pairing between graphene valleys K and K^{'} with a superconducting critical temperature T_{c}∼1  K, in agreement with the experiment. Expand
Charge-2e skyrmion condensate in a hidden-order state
A higher angular momentum ($\ell =2$) $d$-density wave, a mixed triplet and a singlet, interestingly, admits skyrmionic textures. The Skyrmions carry charge $2e$ and can condense into a spin-singletExpand
Unconventional superconductivity in magic-angle graphene superlattices
TLDR
The realization of intrinsic unconventional superconductivity is reported—which cannot be explained by weak electron–phonon interactions—in a two-dimensional superlattice created by stacking two sheets of graphene that are twisted relative to each other by a small angle. Expand
Electronic correlations in twisted bilayer graphene near the magic angle
Twisted bilayer graphene with a twist angle of around 1.1° features a pair of isolated flat electronic bands and forms a platform for investigating strongly correlated electrons. Here, we useExpand
Unconventional Superconductivity and Density Waves in Twisted Bilayer Graphene
We study electronic ordering instabilities of twisted bilayer graphene with $n=2$ electrons per supercell, where correlated insulator state and superconductivity are recently observed. Motivated byExpand
Maximized electron interactions at the magic angle in twisted bilayer graphene
TLDR
Scanning tunnelling spectroscopy is used to map the atomic-scale electronic structure of magic-angle twisted bilayer graphene, finding multiple signatures of electron correlations and thus providing insight into the sought-after mechanism behind superconductivity in graphene. Expand
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