Observation of Landau Level-Dependent Aharonov-Bohm-Like Oscillations in a Topological Insulator

Shiu-Ming Huang; Chien Lin; Sheng-Yu You; Pin-Cyuan Chen; Jai-Long Hong; Jyun-Fong Wong; You-Jhih Yan; Shih-Hsun Yu; Mitch M C Chou

doi:10.1186/s11671-020-03389-8

Observation of Landau Level-Dependent Aharonov-Bohm-Like Oscillations in a Topological Insulator

Nanoscale Res Lett. 2020 Aug 26;15(1):171. doi: 10.1186/s11671-020-03389-8.

Authors

Shiu-Ming Huang^{1

2}, Chien Lin³, Sheng-Yu You³, Pin-Cyuan Chen³, Jai-Long Hong³, Jyun-Fong Wong³, You-Jhih Yan⁴, Shih-Hsun Yu⁴, Mitch M C Chou^{5

4}

Affiliations

¹ Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424, Taiwan. smhuang@mail.nsysu.edu.tw.
² Taiwan Consortium of Emergent Crystalline Materials, TCECM, National Sun Yat-Sen University, Kaohsiung, 80424, Taiwan. smhuang@mail.nsysu.edu.tw.
³ Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424, Taiwan.
⁴ Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung, 80424, Taiwan.
⁵ Taiwan Consortium of Emergent Crystalline Materials, TCECM, National Sun Yat-Sen University, Kaohsiung, 80424, Taiwan.

Abstract

We study the quantum oscillations in the BiSbTe₃ topological insulator. In addition to the Shubnikov-de Haas (SdH) oscillation, the Aharonov-Bohm-like (ABL) oscillations are also observed. The ABL oscillation period is constant at each Landau level (LL) which is determined from the SdH oscillation. The shorter ABL oscillation periods are observed at lower LLs. The oscillation period is proportional to the square root of the LL at temperatures. The ratio of the ABL oscillation period to the effective mass is weak LL dependence. The LL-dependent ABL oscillation might originate from the LL-dependent effective mass.

Keywords: Aharonov-Bohm-like oscillations; Landau level; Shubnikov-de Haas oscillation.