Gate control of 2D magnetism in tri- and four-layers \(\rm CrI_3\)/graphene heterostructures

We conduct experimental studies on the electrical transport properties of monolayer graphene directly covered by a few layers of \(\rm CrI_3\). We do not observe the expected magnetic exchange coupling in the graphene but instead discover proximity effects featuring gate and magnetic field tunabilit...

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Bibliographic Details
Published in:arXiv.org 2024-04
Main Authors: Wang, Ping, Lian, Fuzhuo, Du, Renjun, Cai, Xiaofan, Song, Bao, Han, Yaqing, Xiao, Jingkuan, Watanabe, Kenji, Taniguchi, Takashi, Wen, Jinsheng, Yang, Hongxin, Mayorov, Alexander S, Wang, Lei, Yu, Geliang
Format: Article
Language:English
Subjects:
Conduction bands
Electric potential
Graphene
Heterostructures
Magnetic fields
Modulation doping
Transport properties
Voltage
Online Access:Get full text
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Summary:We conduct experimental studies on the electrical transport properties of monolayer graphene directly covered by a few layers of \(\rm CrI_3\). We do not observe the expected magnetic exchange coupling in the graphene but instead discover proximity effects featuring gate and magnetic field tunability. The tunability of gate voltage is manifested in the alignment of the lowest conduction band of \(\rm CrI_3\) and the Fermi level of graphene, which can be controlled by the gate voltage. The coexistence of the normal and atypical quantum Hall effects in our device also corresponds to gate-control modulation doping. The lowest conduction band depends on the magnetic states of the \(\rm CrI_3\) and can be altered by the magnetic field, which corresponds to the resistance loops during back-and-forth sweeps of the magnetic field. Our results serve as a reference for exploiting the magnetic proximity effects in graphene.
ISSN:2331-8422
DOI:10.48550/arxiv.2404.18061