Manipulation of chiral interface states in a moiré quantum anomalous Hall insulator

Zhang, Canxun; Zhu, Tiancong; Kahn, Salman; Soejima, Tomohiro; Watanabe, Kenji; Taniguchi, Takashi; Zettl, Alex; Wang, Feng; Zaletel, Michael P.; Crommie, Michael F.

doi:10.1038/s41567-024-02444-w

Title: Manipulation of chiral interface states in a moiré quantum anomalous Hall insulator

Journal Article · 13 March 2024 · Nature Physics

DOI: https://doi.org/10.1038/s41567-024-02444-w · OSTI ID:2375816

^[1];

^[2];

^[3]; Soejima, Tomohiro ^[4];

^[5];

^[5]; Zettl, Alex ^[6];

^[6]; Zaletel, Michael P. ^[3];

^[6]

Univ. of California, Santa Barbara, CA (United States); Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Kavli Energy NanoScience Institute, Berkeley, CA (United States)
Purdue Univ., West Lafayette, IN (United States); Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States)
National Institute for Materials Science (NIMS), Tsukuba (Japan)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Kavli Energy NanoScience Institute, Berkeley, CA (United States)

Moiré systems made from stacked two-dimensional materials host correlated and topological states that can be electrically controlled with applied gate voltages. One prevalent form of topological state that can occur are Chern insulators that display a quantum anomalous Hall effect. Here we manipulate Chern domains in an interaction-driven quantum anomalous Hall insulator made from twisted monolayer–bilayer graphene and observe chiral interface states at the boundary between different domains. By tuning the carrier concentration, we stabilize neighbouring domains of opposite Chern number that then provide topological interfaces devoid of any structural boundaries. This allows the wavefunction of chiral interface states to be directly imaged using a scanning tunnelling microscope. In conclusion, our theoretical analysis confirms the chiral nature of observed interface states and allows us to determine the characteristic length scale of valley polarization reversal across neighbouring Chern domains.

View Accepted Manuscript (DOE)

Cite

Export

Save

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Science Foundation (NSF); Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2375816

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 6 Vol. 20; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

References (35)

Nanoscale Control of Rewriteable Doping Patterns in Pristine Graphene/Boron Nitride Heterostructures Velasco, Jairo; Ju, Long; Wong, Dillon Nano Letters, Vol. 16, Issue 3 https://doi.org/10.1021/acs.nanolett.5b04441	journal	February 2016
Low-Temperature Ohmic Contact to Monolayer MoS ₂ by van der Waals Bonded Co/ h -BN Electrodes Cui, Xu; Shih, En-Min; Jauregui, Luis A. Nano Letters, Vol. 17, Issue 8 https://doi.org/10.1021/acs.nanolett.7b01536	journal	July 2017
Effective Cleaning of Hexagonal Boron Nitride for Graphene Devices Garcia, Andrei G. F.; Neumann, Michael; Amet, François Nano Letters, Vol. 12, Issue 9 https://doi.org/10.1021/nl3011726	journal	January 2012
Localization of Dirac Electrons in Rotated Graphene Bilayers Trambly de Laissardière, G.; Mayou, D.; Magaud, L. Nano Letters, Vol. 10, Issue 3 https://doi.org/10.1021/nl902948m	journal	March 2010
Edge channels of broken-symmetry quantum Hall states in graphene visualized by atomic force microscopy Kim, Sungmin; Schwenk, Johannes; Walkup, Daniel Nature Communications, Vol. 12, Issue 1 https://doi.org/10.1038/s41467-021-22886-7	journal	May 2021
Imaging moiré deformation and dynamics in twisted bilayer graphene de Jong, Tobias A.; Benschop, Tjerk; Chen, Xingchen Nature Communications, Vol. 13, Issue 1 https://doi.org/10.1038/s41467-021-27646-1	journal	January 2022
Local spectroscopy of a gate-switchable moiré quantum anomalous Hall insulator Zhang, Canxun; Zhu, Tiancong; Soejima, Tomohiro Nature Communications, Vol. 14, Issue 1 https://doi.org/10.1038/s41467-023-39110-3	journal	June 2023
Topological charge density waves at half-integer filling of a moiré superlattice Polshyn, H.; Zhang, Y.; Kumar, M. A. Nature Physics, Vol. 18, Issue 1 https://doi.org/10.1038/s41567-021-01418-6	journal	December 2021
Chern mosaic and Berry-curvature magnetism in magic-angle graphene Grover, Sameer; Bocarsly, Matan; Uri, Aviram Nature Physics, Vol. 18, Issue 8 https://doi.org/10.1038/s41567-022-01635-7	journal	June 2022
Intrinsic spin Hall torque in a moiré Chern magnet Tschirhart, C. L.; Redekop, Evgeny; Li, Lizhong Nature Physics, Vol. 19, Issue 6 https://doi.org/10.1038/s41567-023-01979-8	journal	March 2023
Maximized electron interactions at the magic angle in twisted bilayer graphene Kerelsky, Alexander; McGilly, Leo J.; Kennes, Dante M. Nature, Vol. 572, Issue 7767 https://doi.org/10.1038/s41586-019-1431-9	journal	July 2019
Electrical switching of magnetic order in an orbital Chern insulator Polshyn, H.; Zhu, J.; Kumar, M. A. Nature, Vol. 588, Issue 7836 https://doi.org/10.1038/s41586-020-2963-8	journal	November 2020
Fractional Chern insulators in magic-angle twisted bilayer graphene Xie, Yonglong; Pierce, Andrew T.; Park, Jeong Min Nature, Vol. 600, Issue 7889 https://doi.org/10.1038/s41586-021-04002-3	journal	December 2021
Quantum anomalous Hall effect from intertwined moiré bands Li, Tingxin; Jiang, Shengwei; Shen, Bowen Nature, Vol. 600, Issue 7890 https://doi.org/10.1038/s41586-021-04171-1	journal	December 2021
Signatures of fractional quantum anomalous Hall states in twisted MoTe2 Cai, Jiaqi; Anderson, Eric; Wang, Chong Nature, Vol. 622, Issue 7981 https://doi.org/10.1038/s41586-023-06289-w	journal	June 2023
Thermodynamic evidence of fractional Chern insulator in moiré MoTe2 Zeng, Yihang; Xia, Zhengchao; Kang, Kaifei Nature, Vol. 622, Issue 7981 https://doi.org/10.1038/s41586-023-06452-3	journal	July 2023
Observation of fractionally quantized anomalous Hall effect Park, Heonjoon; Cai, Jiaqi; Anderson, Eric Nature, Vol. 622, Issue 7981 https://doi.org/10.1038/s41586-023-06536-0	journal	August 2023
WSXM : A software for scanning probe microscopy and a tool for nanotechnology Horcas, I.; Fernández, R.; Gómez-Rodríguez, J. M. Review of Scientific Instruments, Vol. 78, Issue 1 https://doi.org/10.1063/1.2432410	journal	January 2007
Moire bands in twisted double-layer graphene Bistritzer, R.; MacDonald, A. H. Proceedings of the National Academy of Sciences, Vol. 108, Issue 30 https://doi.org/10.1073/pnas.1108174108	journal	July 2011
Topological quantum computation based on chiral Majorana fermions Lian, Biao; Sun, Xiao-Qi; Vaezi, Abolhassan Proceedings of the National Academy of Sciences, Vol. 115, Issue 43 https://doi.org/10.1073/pnas.1810003115	journal	October 2018
Quantised Hall effect in a two-dimensional periodic potential Streda, P. Journal of Physics C: Solid State Physics, Vol. 15, Issue 36 https://doi.org/10.1088/0022-3719/15/36/006	journal	December 1982
Gate-tunable topological flat bands in twisted monolayer-bilayer graphene Park, Youngju; Chittari, Bheema Lingam; Jung, Jeil Physical Review B, Vol. 102, Issue 3 https://doi.org/10.1103/PhysRevB.102.035411	journal	July 2020
Chiral topological superconductor from the quantum Hall state Qi, Xiao-Liang; Hughes, Taylor L.; Zhang, Shou-Cheng Physical Review B, Vol. 82, Issue 18 https://doi.org/10.1103/PhysRevB.82.184516	journal	November 2010
Chiral topological superconductor and half-integer conductance plateau from quantum anomalous Hall plateau transition Wang, Jing; Zhou, Quan; Lian, Biao Physical Review B, Vol. 92, Issue 6 https://doi.org/10.1103/PhysRevB.92.064520	journal	August 2015
Nearly flat Chern bands in moiré superlattices Zhang, Ya-Hui; Mao, Dan; Cao, Yuan Physical Review B, Vol. 99, Issue 7 https://doi.org/10.1103/PhysRevB.99.075127	journal	February 2019
Hubbard Model Physics in Transition Metal Dichalcogenide Moiré Bands Wu, Fengcheng; Lovorn, Timothy; Tutuc, Emanuel Physical Review Letters, Vol. 121, Issue 2 https://doi.org/10.1103/PhysRevLett.121.026402	journal	July 2018
Topological Insulators in Twisted Transition Metal Dichalcogenide Homobilayers Wu, Fengcheng; Lovorn, Timothy; Tutuc, Emanuel Physical Review Letters, Vol. 122, Issue 8 https://doi.org/10.1103/PhysRevLett.122.086402	journal	February 2019
Topological flat bands and correlated states in twisted monolayer-bilayer graphene Rademaker, Louk; Protopopov, Ivan V.; Abanin, Dmitry A. Physical Review Research, Vol. 2, Issue 3 https://doi.org/10.1103/PhysRevResearch.2.033150	journal	July 2020
Measuring local moiré lattice heterogeneity of twisted bilayer graphene Benschop, Tjerk; de Jong, Tobias A.; Stepanov, Petr Physical Review Research, Vol. 3, Issue 1 https://doi.org/10.1103/PhysRevResearch.3.013153	journal	February 2021
Observation of Integer and Fractional Quantum Anomalous Hall Effects in Twisted Bilayer MoTe2 Xu, Fan; Sun, Zheng; Jia, Tongtong Physical Review X, Vol. 13, Issue 3 https://doi.org/10.1103/PhysRevX.13.031037	journal	September 2023
Quantum Valley Hall Effect, Orbital Magnetism, and Anomalous Hall Effect in Twisted Multilayer Graphene Systems Liu, Jianpeng; Ma, Zhen; Gao, Jinhua Physical Review X, Vol. 9, Issue 3 https://doi.org/10.1103/PhysRevX.9.031021	journal	August 2019
Chiral Luttinger liquids at the fractional quantum Hall edge Chang, A. M. Reviews of Modern Physics, Vol. 75, Issue 4 https://doi.org/10.1103/RevModPhys.75.1449	journal	November 2003
Chiral interconnects based on topological insulators Zhang, Xiao; Zhang, Shou-Cheng SPIE Defense, Security, and Sensing, SPIE Proceedings https://doi.org/10.1117/12.920325	conference	May 2012
Intrinsic quantized anomalous Hall effect in a moiré heterostructure Serlin, M.; Tschirhart, C. L.; Polshyn, H. Science, Vol. 367, Issue 6480 https://doi.org/10.1126/science.aay5533	journal	December 2019
Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities Jung, Han Sae; Tsai, Hsin-Zon; Wong, Dillon Journal of Visualized Experiments, Issue 101 https://doi.org/10.3791/52711	journal	January 2015

Similar Records

Local spectroscopy of a gate-switchable moiré quantum anomalous Hall insulator

Journal Article · 2023 · Nature Communications · OSTI ID:1985547

Zhang, Canxun; Zhu, Tiancong; Soejima, Tomohiro; +7 more

Intrinsic quantized anomalous Hall effect in a moiré heterostructure

Journal Article · 2019 · Science · OSTI ID:1800574

Serlin, M.; Tschirhart, C. L.; Polshyn, H.; +6 more

Intrinsic quantized anomalous Hall effect in a moiré heterostructure

Journal Article · 2019 · Science · OSTI ID:1600874

Serlin, M.; Tschirhart, C. L.; Polshyn, H.; +6 more

Related Subjects

36 MATERIALS SCIENCE

Title: Manipulation of chiral interface states in a moiré quantum anomalous Hall insulator

Citation Formats

References (35)

Similar Records

Related Subjects