Approaching quantum anomalous Hall effect in proximity-coupled YIG/graphene/h-BN sandwich structure
Abstract
Quantum anomalous Hall state is expected to emerge in Dirac electron systems such as graphene under both sufficiently strong exchange and spin-orbit interactions. In pristine graphene, neither interaction exists; however, both interactions can be acquired by coupling graphene to a magnetic insulator as revealed by the anomalous Hall effect. Here, we show enhanced magnetic proximity coupling by sandwiching graphene between a ferrimagnetic insulator yttrium iron garnet (YIG) and hexagonal-boron nitride (h-BN) which also serves as a top gate dielectric. By sweeping the top-gate voltage, we observe Fermi level-dependent anomalous Hall conductance. As the Dirac point is approached from both electron and hole sides, the anomalous Hall conductance reaches ¼ of the quantum anomalous Hall conductance 2e2/h. The exchange coupling strength is determined to be as high as 27 meV from the transition temperature of the induced magnetic phase. YIG/graphene/h-BN is an excellent heterostructure for demonstrating proximity-induced interactions in two-dimensional electron systems.
- Authors:
-
- Univ. of California, Riverside, CA (United States). Dept. of Physics and Astronomy
- National Inst. for Materials Science (NIMS), Tsukuba (Japan). Advanced Materials Lab.
- Univ. of California, Riverside, CA (United States). Dept. of Physics and Astronomy; The Ohio State Univ., Columbus, OH (United States). Dept. of Physics
- Publication Date:
- Research Org.:
- Univ. of California, Riverside, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1501548
- Alternate Identifier(s):
- OSTI ID: 1406647
- Grant/Contract Number:
- FG02-07ER46351; SC0010597; 1202559; 1610447
- Resource Type:
- Accepted Manuscript
- Journal Name:
- APL Materials
- Additional Journal Information:
- Journal Volume: 6; Journal Issue: 2; Journal ID: ISSN 2166-532X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; spin-orbit interactions; crystallography; magnetism; Hall effect; ferromagnetic materials; exchange coupling; graphene; dielectric materials; electrostatics; exchange interactions
Citation Formats
Tang, Chi, Cheng, Bin, Aldosary, Mohammed, Wang, Zhiyong, Jiang, Zilong, Watanabe, K., Taniguchi, T., Bockrath, Marc, and Shi, Jing. Approaching quantum anomalous Hall effect in proximity-coupled YIG/graphene/h-BN sandwich structure. United States: N. p., 2017.
Web. doi:10.1063/1.5001318.
Tang, Chi, Cheng, Bin, Aldosary, Mohammed, Wang, Zhiyong, Jiang, Zilong, Watanabe, K., Taniguchi, T., Bockrath, Marc, & Shi, Jing. Approaching quantum anomalous Hall effect in proximity-coupled YIG/graphene/h-BN sandwich structure. United States. https://doi.org/10.1063/1.5001318
Tang, Chi, Cheng, Bin, Aldosary, Mohammed, Wang, Zhiyong, Jiang, Zilong, Watanabe, K., Taniguchi, T., Bockrath, Marc, and Shi, Jing. Thu .
"Approaching quantum anomalous Hall effect in proximity-coupled YIG/graphene/h-BN sandwich structure". United States. https://doi.org/10.1063/1.5001318. https://www.osti.gov/servlets/purl/1501548.
@article{osti_1501548,
title = {Approaching quantum anomalous Hall effect in proximity-coupled YIG/graphene/h-BN sandwich structure},
author = {Tang, Chi and Cheng, Bin and Aldosary, Mohammed and Wang, Zhiyong and Jiang, Zilong and Watanabe, K. and Taniguchi, T. and Bockrath, Marc and Shi, Jing},
abstractNote = {Quantum anomalous Hall state is expected to emerge in Dirac electron systems such as graphene under both sufficiently strong exchange and spin-orbit interactions. In pristine graphene, neither interaction exists; however, both interactions can be acquired by coupling graphene to a magnetic insulator as revealed by the anomalous Hall effect. Here, we show enhanced magnetic proximity coupling by sandwiching graphene between a ferrimagnetic insulator yttrium iron garnet (YIG) and hexagonal-boron nitride (h-BN) which also serves as a top gate dielectric. By sweeping the top-gate voltage, we observe Fermi level-dependent anomalous Hall conductance. As the Dirac point is approached from both electron and hole sides, the anomalous Hall conductance reaches ¼ of the quantum anomalous Hall conductance 2e2/h. The exchange coupling strength is determined to be as high as 27 meV from the transition temperature of the induced magnetic phase. YIG/graphene/h-BN is an excellent heterostructure for demonstrating proximity-induced interactions in two-dimensional electron systems.},
doi = {10.1063/1.5001318},
journal = {APL Materials},
number = 2,
volume = 6,
place = {United States},
year = {Thu Nov 02 00:00:00 EDT 2017},
month = {Thu Nov 02 00:00:00 EDT 2017}
}
Web of Science
Figures / Tables:
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