Even-denominator fractional quantum Hall state in bilayer graphene

doi:10.7498/aps.71.20220905

	Even-denominator fractional quantum Hall state in bilayer graphene
	Li Qing-Xin 1,2; Huang Yan 1,2; Chen Yi-Wei 1,2; Zhu Yu-Jian 1,2; Zhu Wang 1,2; Song Jun-Wei 1,2; An Dong-Dong 1,2; Gan Qi-Kang 1,2; Wang Kai-Yuan 1,2; Wang Hao-Lin 1,2
刊名	ACTA PHYSICA SINICA
	2022-09-20
卷号	71
关键词	graphene fractional quantum Hall effect topological phase
ISSN号	1000-3290
DOI	10.7498/aps.71.20220905
通讯作者	Wang Hao-Lin(hlwang@nju.edu.cn) ; Yu Ge-Liang(yugeliang@nju.edu.cn) ; Wang Lei(leiwang@nju.edu.cn)
英文摘要	At a half-filled Landau level, composite fermions with chiral p-wave pairing will form a Moore-Read state which hosts charge-e/4 fractional excitation. This excitation supports non-Abelian statistics and has potential to enable topological quantum computation. Owing to the SU(4) symmetry of electron and electric-field tunability, the bilayer graphene becomes an ideal platform for exploring physics of multi-component quantum Hall state and is candidate for realizing non-Abelian statistics. In this work, high-quality bilayer graphene/hBN heterostructure is fabricated by using dry-transfer technique, and electric transport measurement is performed to study quantum Hall state behavior in bilayer graphene under electric field and magnetic field. Under strong magnetic field, the sequences of incompressible state with quantized Hall conductivity are revealed at -5/2, -1/2, 3/2 filling of Landau level. The feature of even-denominator quantum Hall state is more visible then weaker with increasing magnetic field, and this corresponds to the polarization of Landau level wave function. The experimental results indicate that the observed even-denominator fractional quantum Hall state belongs to the topological phase described by Pfaffian wavefunction.
资助项目	National Natural Science Foundation of China[12074173] ; Program for Innovative Talents and Entrepreneur in Jiangsu Province, China[JSSCTD202101] ; Excellent User Program of Hefei Science Center, Chinese Academy of Sciences, China[2021HSC-UE007] ; Excellent User Program of Hefei Science Center, Chinese Academy of Sciences, China[2021HSC-UE011] ; Jiangsu Outstanding Youth Project, China[BK20220066]
WOS关键词	FERROMAGNETISM ; VALLEY ; PHASES ; SPIN
WOS研究方向	Physics
语种	英语
出版者	CHINESE PHYSICAL SOC
WOS记录号	WOS:000881653200026
资助机构	National Natural Science Foundation of China ; Program for Innovative Talents and Entrepreneur in Jiangsu Province, China ; Excellent User Program of Hefei Science Center, Chinese Academy of Sciences, China ; Jiangsu Outstanding Youth Project, China
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/130182]
专题	中国科学院合肥物质科学研究院
通讯作者	Wang Hao-Lin; Yu Ge-Liang; Wang Lei
作者单位	1.Nanjing Univ, Dept Phys, Natl Lab Solid State Microstructures, Nanjing 210093, Peoples R China 2.Nanjing Univ, Collaborat Innovat Ctr Adv Microstructures, Nanjing 210093, Peoples R China 3.Chinese Acad Sci, High Field Magnet Lab, Hefei 230031, Peoples R China 4.Hubei Jiufengshan Lab, Wuhan 430206, Peoples R China
推荐引用方式 GB/T 7714	Li Qing-Xin,Huang Yan,Chen Yi-Wei,et al. Even-denominator fractional quantum Hall state in bilayer graphene[J]. ACTA PHYSICA SINICA,2022,71.
APA	Li Qing-Xin.,Huang Yan.,Chen Yi-Wei.,Zhu Yu-Jian.,Zhu Wang.,...&Wang Lei.(2022).Even-denominator fractional quantum Hall state in bilayer graphene.ACTA PHYSICA SINICA,71.
MLA	Li Qing-Xin,et al."Even-denominator fractional quantum Hall state in bilayer graphene".ACTA PHYSICA SINICA 71(2022).