Spectroscopic signatures of many-body correlations in magic-angle twisted bilayer graphene.

Nature
Yonglong XieAli Yazdani

Abstract

The discovery of superconducting and insulating states in magic-angle twisted bilayer graphene (MATBG)1,2 has ignited considerable interest in understanding the nature of electronic interactions in this chemically pristine material. The transport properties of MATBG as a function of doping are similar to those of high-transition-temperature copper oxides and other unconventional superconductors1-3, which suggests that MATBG may be a highly interacting system. However, to our knowledge, there is no direct experimental evidence of strong many-body correlations in MATBG. Here we present high-resolution spectroscopic measurements, obtained using a scanning tunnelling microscope, that provide such evidence as a function of carrier density. MATBG displays unusual spectroscopic characteristics that can be attributed to electron-electron interactions over a wide range of doping levels, including those at which superconductivity emerges in this system. We show that our measurements cannot be explained with a mean-field approach for modelling electron-electron interactions in MATBG. The breakdown of a mean-field approach when applied to other correlated superconductors, such as copper oxides, has long inspired the study of the highly cor...Continue Reading

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Citations

Mar 29, 2020·Physical Review Letters·Ahmed AbouelkomsanEmil J Bergholtz
Aug 22, 2020·Science Advances·Rafael M Fernandes, Jörn W F Venderbos
Apr 14, 2020·Physical Review Letters·Biao LianJing Wang
May 23, 2020·Physical Review Letters·J González, T Stauber
Jul 17, 2020·Nature·Harpreet Singh AroraStevan Nadj-Perge
Feb 15, 2020·Physical Review Letters·Fengcheng Wu, Sankar Das Sarma
Aug 29, 2020·Physical Review Letters·Xiao LinTony Low
Mar 24, 2020·Physical Review Letters·Ming Xie, A H MacDonald
Jul 8, 2020·Nature·Petr StepanovDmitri K Efetov
Oct 20, 2020·Nanoscale Horizons : the Home for Rapid Reports of Exceptional Significance in Nanoscience and Nanotechnolgy·Naihua MiaoZhimei Sun
Nov 11, 2020·Proceedings of the National Academy of Sciences of the United States of America·Maine ChristosMathias S Scheurer
Nov 22, 2020·Science Advances·Shuai ZhangQunyang Li
Jan 20, 2021·Nature·Youngjoon ChoiStevan Nadj-Perge
Jan 21, 2021·Proceedings of the National Academy of Sciences of the United States of America·Alexander KerelskyAbhay N Pasupathy
Oct 30, 2020·Optics Express·Noriko WatariTakashi Ishide
Dec 19, 2020·Physical Review Letters·Jonah Herzog-ArbeitmanB Andrei Bernevig
Dec 15, 2020·Physical Review Letters·Ying Su, Shi-Zeng Lin
Nov 20, 2020·Nature Materials·Eva Y Andrei, Allan H MacDonald
Feb 10, 2021·Nature Materials·Hongyuan LiMichael F Crommie
Jan 16, 2021·Physical Review Letters·Da-Shuai MaB Andrei Bernevig
Nov 21, 2020·Physical Review Letters·A García-RuizV I Fal'ko
Feb 27, 2021·Physical Review Letters·Bing LiuZ F Wang
Mar 13, 2021·Science·Ali Yazdani
Mar 27, 2021·Advanced Materials·Dong QiuJie Xiong
Mar 27, 2021·ACS Nano·Feng HeYaguo Wang
Apr 2, 2021·Nature·Jeong Min ParkPablo Jarillo-Herrero
Apr 17, 2021·Physical Review Letters·Beicheng LouShanhui Fan
May 6, 2021·Nature Communications·Canxun ZhangMichael F Crommie
May 14, 2021·Nature Communications·Xiaomeng LiuAli Yazdani

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Software Mentioned

MATBG

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