Maximized electron interactions at the magic angle in twisted bilayer graphene.

Nature
Alexander KerelskyAbhay N Pasupathy

Abstract

The electronic properties of heterostructures of atomically thin van der Waals crystals can be modified substantially by moiré superlattice potentials from an interlayer twist between crystals1,2. Moiré tuning of the band structure has led to the recent discovery of superconductivity3,4 and correlated insulating phases5 in twisted bilayer graphene (TBG) near the 'magic angle' of twist of about 1.1 degrees, with a phase diagram reminiscent of high-transition-temperature superconductors. Here we directly map the atomic-scale structural and electronic properties of TBG near the magic angle using scanning tunnelling microscopy and spectroscopy. We observe two distinct van Hove singularities (VHSs) in the local density of states around the magic angle, with an energy separation of 57 millielectronvolts that drops to 40 millielectronvolts with high electron/hole doping. Unexpectedly, the VHS energy separation continues to decrease with decreasing twist angle, with a lowest value of 7 to 13 millielectronvolts at a magic angle of 0.79 degrees. More crucial to the correlated behaviour of this material, we find that at the magic angle, the ratio of the Coulomb interaction to the bandwidth of each individual VHS (U/t) is maximized, which ...Continue Reading

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Citations

Aug 2, 2019·Nature·Mathias S Scheurer
Feb 15, 2020·Physical Review Letters·Fengcheng Wu, Sankar Das Sarma
Apr 14, 2020·Physical Review Letters·Biao LianJing Wang
Jul 8, 2020·Nature·Petr StepanovDmitri K Efetov
Sep 12, 2020·Physical Review Letters·C De BeuleP Recher
Dec 20, 2019·Nature Communications·Noah F Q YuanLiang Fu
Aug 4, 2020·Physical Review Letters·Tymoteusz SalamonDebraj Rakshit
Aug 29, 2020·Physical Review Letters·Xiao LinTony Low
Jul 17, 2020·Nature·Harpreet Singh AroraStevan Nadj-Perge
Mar 1, 2020·Nature Communications·D M KennesA Rubio
May 23, 2020·Physical Review Letters·J González, T Stauber
Jun 24, 2020·Nature Nanotechnology·Leo J McGillyAbhay N Pasupathy
Mar 24, 2020·Physical Review Letters·Ming Xie, A H MacDonald
Dec 7, 2019·Physical Review Letters·Moon Jip ParkSungBin Lee
May 10, 2020·Physical Review Letters·Nick BultinckMichael P Zaletel
Aug 22, 2020·Science Advances·Rafael M Fernandes, Jörn W F Venderbos
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
Jan 26, 2021·Advanced Materials·Jaehyung YuPinshane Y Huang
Nov 20, 2020·Nature Materials·Eva Y Andrei, Allan H MacDonald
Dec 19, 2020·Physical Review Letters·Davide CurcioPhilip Hofmann
Dec 15, 2020·Physical Review Letters·Ying Su, Shi-Zeng Lin
Nov 21, 2020·Physical Review Letters·A García-RuizV I Fal'ko
Feb 10, 2021·Nature Materials·Hongyuan LiMichael F Crommie
Feb 18, 2021·Chemical Reviews·Xin GuiWeiwei Xie
Feb 27, 2021·Physical Review Letters·Bing LiuZ F Wang
Mar 10, 2021·The Journal of Chemical Physics·Tor S HauglandHenrik Koch

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