作者: Xiang Hu , Timo Hyart , Dmitry I. Pikulin , Enrico Rossi
DOI: 10.1103/PHYSREVLETT.123.237002
关键词: Superconductivity 、 Superfluidity 、 Magic angle 、 Effective mass (solid-state physics) 、 Graphene 、 Pairing 、 Condensed matter physics 、 Bilayer graphene 、 Quantum geometry 、 Physics
摘要: By tuning the angle between graphene layers to specific “magic angles” the lowest energy bands of twisted bilayer graphene (TBLG) can be made flat. The flat nature of the bands favors the formation of collective ground states and, in particular, TBLG has been shown to support superconductivity. When the energy bands participating in the superconductivity are well isolated, the superfluid weight scales inversely with the effective mass of such bands. For flat band systems one would therefore conclude that even if superconducting pairing is …