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Twisted Bilayer Graphene: A Phonon Driven Superconductor by Lian, Biao; Wang, Zhijun; Bernevig, B. Andrei is a scholarly article available to read on EtoBox.

What is Twisted Bilayer Graphene: A Phonon Driven Superconductor about?

We study the electron-phonon coupling in twisted bilayer graphene (TBG), which was recently experimentally observed to exhibit superconductivity around the magic twist angle $\theta\approx 1.05^\circ$. We show that phonon-mediated electron 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 $T_c\sim1K$, in agreement with the experiment. We predict that superconductivity can also be observed in TBG at many other angles $\theta$ and higher electron densities in higher Moir\'e bands, which may also explain the possible granular superconductivity of highly oriented pyrolytic graphite. We support our conclusions by \emph{ab initio} calculations.

Author

Lian, Biao; Wang, Zhijun; Bernevig, B. Andrei

Published

2018

Language

EN