Tunable correlated Chern insulator and ferromagnetism in a moiré superlattice.

Nature
Guorui ChenFeng Wang

Abstract

Studies of two-dimensional electron systems in a strong magnetic field revealed the quantum Hall effect1, a topological state of matter featuring a finite Chern number C and chiral edge states2,3. Haldane4 later theorized that Chern insulators with integer quantum Hall effects could appear in lattice models with complex hopping parameters even at zero magnetic field. The ABC-trilayer graphene/hexagonal boron nitride (ABC-TLG/hBN) moiré superlattice provides an attractive platform with which to explore Chern insulators because it features nearly flat moiré minibands with a valley-dependent, electrically tunable Chern number5,6. Here we report the experimental observation of a correlated Chern insulator in an ABC-TLG/hBN moiré superlattice. We show that reversing the direction of the applied vertical electric field switches the moiré minibands of ABC-TLG/hBN between zero and finite Chern numbers, as revealed by large changes in magneto-transport behaviour. For topological hole minibands tuned to have a finite Chern number, we focus on quarter filling, corresponding to one hole per moiré unit cell. The Hall resistance is well quantized at h/2e2 (where h is Planck's constant and e is the charge on the electron), which implies C = 2...Continue Reading

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Citations

Jul 8, 2020·Nature·Petr StepanovDmitri K Efetov
Jul 25, 2020·Nature Materials·Junwei Liu
May 23, 2020·Physical Review Letters·Cécile RepellinT Senthil
Oct 22, 2020·Light, Science & Applications·Jianyu ZhangKostya S Novoselov
Nov 25, 2020·Nature·Zhiren ZhengPablo Jarillo-Herrero
Dec 18, 2020·Nature·Yi-Fan ZhaoCui-Zu Chang
Feb 3, 2021·Nature·Jeong Min ParkPablo Jarillo-Herrero
Feb 10, 2021·Nature Materials·Hongyuan LiMichael F Crommie
Nov 4, 2020·Nature Nanotechnology·Yanhao TangJie Shan
Nov 5, 2020·Nature Communications·Subhajit SinhaMandar M Deshmukh
Dec 15, 2020·Physical Review Letters·Ying Su, Shi-Zeng Lin
Dec 15, 2020·Physical Review Letters·Jihang ZhuA H MacDonald
Feb 20, 2021·Physical Review Letters·Chunli HuangAllan H MacDonald
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
Mar 31, 2021·Physical Review Letters·Yanyan HeDa-Wei Wang
May 6, 2021·Nature Communications·Canxun ZhangMichael F Crommie
May 11, 2021·Nano Letters·Elizabeth MarcellinaQihua Xiong
May 29, 2021·Science·C L TschirhartA F Young
Jul 9, 2021·ACS Applied Materials & Interfaces·Hao TanWensheng Yan
Jul 29, 2021·The Journal of Physical Chemistry Letters·Hongjian WuKostya S Novoselov
Aug 13, 2021·The Journal of Physical Chemistry Letters·Rui XiaMeizhen Gao
Jul 22, 2020·Nano Letters·Chao MaFengnian Xia
Aug 25, 2021·Nature Nanotechnology·Tingxin LiKin Fai Mak

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