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Title: Theory of phonon-mediated superconductivity in twisted bilayer graphene

Journal Article · · Physical Review Letters
 [1];  [2];  [3]
  1. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Maryland, College Park, MD (United States)
  2. Univ. of Texas at Austin, Austin, TX (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)

We present a theory of phonon-mediated superconductivity in near magic angle twisted bilayer graphene. Using a microscopic model for phonon coupling to moire band electrons, we find that phonons generate attractive interactions in both s- and d-wave pairing channels and that the attraction is strong enough to explain the experimental superconducting transition temperatures. Before including Coulomb repulsion, the s-wave channel is more favorable; however, on-site Coulomb repulsion can suppress s-wave pairing relative to d wave. The pair amplitude varies spatially with the moire period, and is identical in the two layers in the s-wave channel but phase shifted by π in the d-wave channel. In conclusion, we discuss experiments that can distinguish the two pairing states.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Welch Foundation; USDOE
Grant/Contract Number:
AC02-06CH11357; FG02-02ER45958; TBF1473
OSTI ID:
1490430
Alternate ID(s):
OSTI ID: 1487188
Journal Information:
Physical Review Letters, Vol. 121, Issue 25; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 260 works
Citation information provided by
Web of Science

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Cited By (30)

High-TC Superconductivity Originating from Interlayer Coulomb Coupling in Gate-Charged Twisted Bilayer Graphene Moiré Superlattices journal July 2019
Theory of correlated insulating behaviour and spin-triplet superconductivity in twisted double bilayer graphene journal November 2019
Magic of high-order van Hove singularity journal December 2019
Large linear-in-temperature resistivity in twisted bilayer graphene journal August 2019
Possible nodeless s ± -wave superconductivity in twisted bilayer graphene journal July 2019
Cold atoms in twisted-bilayer optical potentials journal November 2019
Ferromagnetism and spin-valley liquid states in moiré correlated insulators journal July 2019
Quantum Monte Carlo study of magnetic ordering and superconducting pairing symmetry in twisted bilayer graphene journal September 2019
Topological transitions in a model for proximity-induced superconductivity journal December 2019
Formation of Bloch Flat Bands in Polar Twisted Bilayers without Magic Angles journal February 2020
Correlated insulating and superconducting states in twisted bilayer graphene below the magic angle journal September 2019
Tuning superconductivity in twisted bilayer graphene journal January 2019
General continuum model for twisted bilayer graphene and arbitrary smooth deformations journal January 2019
Kohn-Luttinger Superconductivity in Twisted Bilayer Graphene text January 2018
Tuning superconductivity in twisted bilayer graphene text January 2018
The pseudo-Landau-level representation of twisted bilayer graphene: band topology and the implications on the correlated insulating phase text January 2018
Nematic superconductivity stabilized by density wave fluctuations: Possible application to twisted bilayer graphene text January 2018
Phonon-induced giant linear-in-$T$ resistivity in magic angle twisted bilayer graphene: Ordinary strangeness and exotic superconductivity text January 2018
Coupled Wire description of the Correlated Physics in Twisted Bilayer Graphene text January 2018
Enhanced correlations and superconductivity in weakly interacting partially flat band systems: a determinantal quantum Monte Carlo study text January 2018
Topological chiral superconductivity with spontaneous vortices and supercurrent in twisted bilayer graphene text January 2018
Magic of high order van Hove singularity text January 2019
Gauge phonon dominated resistivity in twisted bilayer graphene near magic angle text January 2019
Designing Flat Band by Strain text January 2019
Quantum valley Hall effect, orbital magnetism, and anomalous Hall effect in twisted multilayer graphene systems text January 2019
Valley Jahn-Teller effect in twisted bilayer graphene text January 2019
Identification of superconducting pairing symmetry in twisted bilayer graphene using in-plane magnetic field and strain text January 2019
Geometric and conventional contribution to superfluid weight in twisted bilayer graphene text January 2019
Superconductor versus insulator in twisted bilayer graphene text January 2019
General continuum model for twisted bilayer graphene and arbitrary smooth deformations text January 2019

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