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Band structure and superconductivity in twisted trilayer graphene
Physical Review B ( IF 3.7 ) Pub Date : 2021-09-27 , DOI: 10.1103/physrevb.104.l121116
Võ Tiến Phong 1 , Pierre A. Pantaleón 2 , Tommaso Cea 2 , Francisco Guinea 2, 3
Affiliation  

We study the symmetries of twisted trilayer graphene's band structure under various extrinsic perturbations, and analyze the role of long-range electron-electron interactions near the first magic angle. The electronic structure is modified by these interactions in a similar way to twisted bilayer graphene. We analyze electron pairing due to long-wavelength charge fluctuations, which are coupled among themselves via the Coulomb interaction and additionally mediated by longitudinal acoustic phonons. We find superconducting phases with either spin-singlet/valley-triplet or spin-triplet/valley-singlet symmetry, with critical temperatures up to a few Kelvin for realistic choices of parameters.

中文翻译:

扭曲的三层石墨烯中的能带结构和超导性

我们研究了扭曲的三层石墨烯在各种外在扰动下的能带结构的对称性,并分析了第一魔角附近长程电子-电子相互作用的作用。这些相互作用以类似于扭曲双层石墨烯的方式改变了电子结构。我们分析了由于长波长电荷波动引起的电子配对,这些波动通过库仑相互作用相互耦合,另外还由纵向声学声子介导。我们发现具有自旋单线态/谷-三重态或自旋-三重态/谷-单线态对称性的超导相,临界温度高达几开尔文,可用于实际选择参数。
更新日期:2021-09-28
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