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23 April 2024 |
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Crossover between Weak Antilocalization and Weak Localization of Bulk States in Ultrathin Bi2Se3 Films | | Huichao Wang
; Cui-Zu Chang
; Haiwen Liu
; Huakun Zuo
; Yanfei Zhao
; Yi Sun
; Zhengcai Xia
; Ke He
; Xucun Ma
; X. C. Xie
; Qi-Kun Xue
; Jian Wang
; | | Date: |
19 Oct 2013 | | Abstract: | We systematically study the magneto-transport properties up to 50 Tesla of
ultrathin topological insulator Bi2Se3 films grown via molecular beam epitaxy
technique. In parallel magnetic field, interestingly, magneto-resistances of
the films are closely related to the relative orientation of field and the
excitation current. When the field is increased at the field perpendicular to
the current configuration, a crossover between weak antilocalization and weak
localization of the bulk states occurs at 4.2 K, while only weak localization
shows up at 77 K. Thus the system also exhibits the crossover from weak
antilocalization to weak localization as the temperature rises in relatively
low magnetic field regime. When the field is parallel to the current, only weak
antilocalization is observed at 4.2 K and 77 K, which may be due to the
crossover appearing above 50 Tesla. As a smoking gun, our work directly shows
the crossover from weak antilocalization to weak localization of the bulk
states in the ultrathin topological insulator films. | | Source: | arXiv, 1310.5194 | | Services: | Forum | Review | PDF | Favorites | |
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