Helical quantum Hall phase in graphene on SrTiO3

doi:10.1126/science.aax8201

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	Helical quantum Hall phase in graphene on SrTiO3
	Veyrat, Louis 2; Deprez, Corentin 2; Coissard, Alexis 2; Li, Xiaoxi 3,4,5; Gay, Frederic 2; Watanabe, Kenji 1; Taniguchi, Takashi 1; Han, Zheng 3,4,5; Piot, Benjamin A.6; Sellier, Hermann 2
刊名	SCIENCE
	2020-02-14
卷号	367 期号:6479 页码:781-+
ISSN号	0036-8075
DOI	10.1126/science.aax8201
通讯作者	Sacepe, Benjamin(benjamin.sacepe@neel.cnrs.fr)
英文摘要	The ground state of charge-neutral graphene under perpendicular magnetic field was predicted to be a quantum Hall topological insulator with a ferromagnetic order and spin-filtered, helical edge channels. In most experiments, however, an insulating state is observed that is accounted for by lattice-scale interactions that promote a broken-symmetry state with gapped bulk and edge excitations. We tuned the ground state of the graphene zeroth Landau level to the topological phase through a suitable screening of the Coulomb interaction with the high dielectric constant of a strontium titanate (SrTiO3) substrate. Robust helical edge transport emerged at magnetic fields as low as 1 tesla and withstanding temperatures up to 110 kelvin over micron-long distances. This versatile graphene platform may find applications in spintronics and topological quantum computation.
资助项目	H2020 ERC grant QUEST[637815] ; Elemental Strategy Initiative ; A3 Foresight by JSPS ; CREST, JST[JPMJCR15F3] ; National Key R&D Program of China[2019YFA0307800] ; National Key R&D Program of China[2017YFA0206302] ; National Natural Science Foundation of China (NSFC)[11504385] ; National Natural Science Foundation of China (NSFC)[U1932151] ; National Natural Science Foundation of China (NSFC)[51627801] ; State Key Laboratory of Quantum Optics and Quantum Optics Devices[KF201816]
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	AMER ASSOC ADVANCEMENT SCIENCE
WOS记录号	WOS:000514105000033
资助机构	H2020 ERC grant QUEST ; Elemental Strategy Initiative ; A3 Foresight by JSPS ; CREST, JST ; National Key R&D Program of China ; National Natural Science Foundation of China (NSFC) ; State Key Laboratory of Quantum Optics and Quantum Optics Devices
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/137983]
专题	金属研究所_中国科学院金属研究所
通讯作者	Sacepe, Benjamin
作者单位	1.Natl Inst Mat Sci, 1-1 Namiki, Tsukuba, Ibaraki 3060044, Japan 2.Univ Grenoble Alpes, CNRS, Inst Neel, Grenoble INP, F-38000 Grenoble, France 3.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 4.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China 5.Shanxi Univ, State Key Lab Quantum Opt & Quantum Opt Devices, Inst Optoelect, Taiyuan 030006, Shanxi, Peoples R China 6.Univ Grenoble Alpes, UPS INSA EMFL CNRS LNCMI, F-38000 Grenoble, France
推荐引用方式 GB/T 7714	Veyrat, Louis,Deprez, Corentin,Coissard, Alexis,et al. Helical quantum Hall phase in graphene on SrTiO3[J]. SCIENCE,2020,367(6479):781-+.
APA	Veyrat, Louis.,Deprez, Corentin.,Coissard, Alexis.,Li, Xiaoxi.,Gay, Frederic.,...&Sacepe, Benjamin.(2020).Helical quantum Hall phase in graphene on SrTiO3.SCIENCE,367(6479),781-+.
MLA	Veyrat, Louis,et al."Helical quantum Hall phase in graphene on SrTiO3".SCIENCE 367.6479(2020):781-+.