Observation of an Odd-Integer Quantum Hall Effect from Topological Surface States in Cd3As2

Lin, Ben-Chuan1; Wang, Shuo1; Wiedmann, Steffen2,3; Lu, Jian-Ming1,2; Zheng, Wen-Zhuang1; Yu, Dapeng4,5; Liao, Zhi-Min1,6,7

2019-01-25

10.1103/PhysRevLett.122.036602

PHYSICAL REVIEW LETTERS   影响因子和分区

0031-9007

1079-7114

The quantum Hall effect (QHE) in a 3D Dirac semimetal thin film is attributed to either the quantum confinement induced bulk subbands or the Weyl orbits that connect the opposite surfaces via bulk Weyl nodes. However, it is still unknown whether the QHE based on theWeyl orbit can survive as the bulkWeyl nodes are gapped. Moreover, there are closed Fermi loops rather than open Fermi arcs on the Dirac semimetal surface, which can also host the QHE. Here we report the QHE in the 3D Dirac semimetal Cd3As2 nanoplate by tuning the gate voltage under a fixed 30 T magnetic field. The quantized Hall plateaus at odd filling factors are observed as a magnetic field along the [001] crystal direction, indicating a Berry's phase pi from the topological surface states. Furthermore, even filling factors are observed when the magnetic field is along the [112] direction, indicating the C-4 rotational symmetry breaking and a topological phase transition. The results shed light on the understanding of QHE in 3D Cd3As2.

SCI ; EI

英语

NI期刊

其他

National Key Research and Development Program of China[2016YFA0300802]

Physics

Physics, Multidisciplinary

WOS:000456783100004

AMER PHYSICAL SOC

20190506444209

Cadmium compounds ; Molecular physics ; Quantum theory ; Surface states ; Topology

Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Classical Physics; Quantum Theory; Relativity:931

PHYSICS

Web of Science

1.Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
2.Radboud Univ Nijmegen, High Field Magnet Lab HFML EMFL, Toernooiveld 7, NL-6525 ED Nijmegen, Netherlands
3.Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 AJ Nijmegen, Netherlands
4.South Univ Sci & Technol China, Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
5.South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China
6.Peking Univ, Beijing Key Lab Quantum Devices, Beijing 100871, Peoples R China
7.Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China

Lin, Ben-Chuan,Wang, Shuo,Wiedmann, Steffen,et al. Observation of an Odd-Integer Quantum Hall Effect from Topological Surface States in Cd3As2[J]. PHYSICAL REVIEW LETTERS,2019,122(3).

Lin, Ben-Chuan.,Wang, Shuo.,Wiedmann, Steffen.,Lu, Jian-Ming.,Zheng, Wen-Zhuang.,...&Liao, Zhi-Min.(2019).Observation of an Odd-Integer Quantum Hall Effect from Topological Surface States in Cd3As2.PHYSICAL REVIEW LETTERS,122(3).

Lin, Ben-Chuan,et al."Observation of an Odd-Integer Quantum Hall Effect from Topological Surface States in Cd3As2".PHYSICAL REVIEW LETTERS 122.3(2019).