扭曲双层石墨烯的超流重和Berezinskiii-Kosterlitz-无扰transition temperature
Superfluid weight and Berezinskii-Kosterlitz-Thouless transition temperature of twisted bilayer graphene
摘要：
研究了具有局域和非局域吸引相互作用的扭曲双层石墨烯的超导电性。在微观紧束缚模型和低能连续模型下，我们得到了超流质量和Berezinskiii-Kosterlitz-BKT转变温度。我们预测本地和非本地的相互作用计划，可以区分实验之间的定性差异。在对势超过带宽的平带极限，我们证明了超流的重量和BKT温度是由多带过程和带的量子几何决定的。
英文摘要：
We study superconductivity of twisted bilayer graphene with local and non-local 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 non-local 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.
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