Coulomb interaction, phonons, and superconductivity in twisted bilayer graphene

被引：64
作者：
Cea, Tommaso [1 ,2 ]
Guinea, Francisco [1 ,3 ,4 ]
机构：
[1] IMDEA Nanosci, Madrid 28015, Spain
[2] CSIC, Inst Ciencia Mat Madrid, Madrid 28049, Spain
[3] Donostia Int Phys Ctr, San Sebastian 20018, Spain
[4] Ikerbasque Basque Fdn Sci, Bilbao 48009, Spain
来源：
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2021年 / 118卷 / 32期
关键词：
graphene; superconductivity; twisted;
D O I：
10.1073/pnas.2107874118
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The polarizability of twisted bilayer graphene, due to the combined effect of electron-hole pairs, plasmons, and acoustic phonons, is analyzed. The screened Coulomb interaction allows for the formation of Cooper pairs and superconductivity in a significant range of twist angles and fillings. The tendency toward superconductivity is enhanced by the coupling between longitudinal phonons and electron-hole pairs. Scattering processes involving large momentum transfers, Umklapp processes, play a crucial role in the formation of Cooper pairs. The magnitude of the superconducting gap changes among the different pockets of the Fermi surface.
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页数：6
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