Superfluid weight and Berezinskii-Kosterlitz-Thouless transition temperature of twisted bilayer graphene
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Details
| Original language | English |
|---|---|
| Article number | 060505 |
| Journal | Physical Review B |
| Volume | 101 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 1 Feb 2020 |
| Publication type | A1 Journal article-refereed |
Abstract
We study superconductivity of twisted bilayer graphene with local and nonlocal attractive interactions. We obtain the superfluid weight and Berezinskii-Kosterlitz-Thouless (BKT) transition temperature for microscopic tight-binding and low-energy continuum models. We predict qualitative differences between local and nonlocal interaction schemes which could be distinguished experimentally. In the flat-band limit where the pair potential exceeds the band width we show that the superfluid weight and BKT temperature are determined by multiband processes and quantum geometry of the band.