Cascade of phase transitions and Dirac revivals in magic-angle graphene

Nature
Uri ZondinerShahal Ilani

Abstract

Twisted bilayer graphene near the magic angle1-4 exhibits rich electron-correlation physics, displaying insulating3-6, magnetic7,8 and superconducting phases4-6. The electronic bands of this system were predicted1,2 to narrow markedly9,10 near the magic angle, leading to a variety of possible symmetry-breaking ground states11-17. Here, using measurements of the local electronic compressibility, we show that these correlated phases originate from a high-energy state with an unusual sequence of band population. As carriers are added to the system, the four electronic 'flavours', which correspond to the spin and valley degrees of freedom, are not filled equally. Rather, they are populated through a sequence of sharp phase transitions, which appear as strong asymmetric jumps of the electronic compressibility near integer fillings of the moiré lattice. At each transition, a single spin/valley flavour takes all the carriers from its partially filled peers, 'resetting' them to the vicinity of the charge neutrality point. As a result, the Dirac-like character observed near charge neutrality reappears after each integer filling. Measurement of the in-plane magnetic field dependence of the chemical potential near filling factor one revea...Continue Reading

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Citations

Jul 17, 2020·Nature·Harpreet Singh AroraStevan Nadj-Perge
Oct 10, 2020·The Journal of Chemical Physics·Mariya Romanova, Vojtěch Vlček
Nov 11, 2020·Proceedings of the National Academy of Sciences of the United States of America·Maine ChristosMathias S Scheurer
Jan 20, 2021·Nature·Youngjoon ChoiStevan Nadj-Perge
Feb 10, 2021·Nature Materials·Hongyuan LiMichael F Crommie
Dec 5, 2020·Physical Review Letters·María Rosendo LópezPablo San-Jose
Jan 23, 2021·Physical Review Letters·Yafei RenQian Niu
Feb 3, 2021·Nature·Jeong Min ParkPablo Jarillo-Herrero
Nov 20, 2020·Nature Materials·Eva Y Andrei, Allan H MacDonald
Jan 13, 2021·Nature Communications·Dorri HalbertalD N Basov
Mar 13, 2021·Science·Ali Yazdani
Mar 27, 2021·Advanced Materials·Dong QiuJie Xiong
Apr 2, 2021·Nature·Jeong Min ParkPablo Jarillo-Herrero
Apr 9, 2021·Nature·Yu SaitoAndrea F Young
May 7, 2021·Science Advances·Eslam KhalafAshvin Vishwanath
May 14, 2021·Nature Communications·Xiaomeng LiuAli Yazdani
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Aug 8, 2021·Proceedings of the National Academy of Sciences of the United States of America·Tommaso Cea, Francisco Guinea
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Aug 25, 2021·Nature Nanotechnology·Tingxin LiKin Fai Mak
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Oct 1, 2021·Nature·Hongyuan LiFeng Wang
Sep 2, 2021·Nature·Haoxin ZhouAndrea F Young

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Methods Mentioned

BETA
electron transistor

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