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26 April 2024 |
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Article overview
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Demonstration of surface transport in a hybrid Bi2Se3/Bi2Te3 heterostructure | | Yanfei Zhao
; Cui-Zu Chang
; Ying Jiang
; Yi Sun
; Huichao Wang
; Ying Xing
; Yong Wang
; Ke He
; Xucun Ma
; Qi-Kun Xue
; Jian Wang
; | | Date: |
24 Aug 2013 | | Abstract: | In spite of much work on topological insulators, direct evidence for surface
transport remains elusive. We grow a high quality heterostructure containing
single quintuple layer (QL) of Bi2Se3 on 19 QLs of Bi2Te3 and compare its
transport properties with 20 QLs Bi2Se3 and 20 QLs Bi2Te3. All three films are
grown on insulating sapphire (0001) substrates by molecular beam epitaxy (MBE).
In situ angle-resolved photoemission spectroscopy (ARPES) provides direct
evidence that the surface state of 1 QL Bi2Se3 / 19 QLs Bi2Te3 heterostructure
is similar to the surface state of the 20 QL Bi2Se3 and different with that of
the 20 QL Bi2Te3. In ex situ transport measurements, the observed linear
magnetoresistance and weak antilocalization of the hybrid heterostructure are
similar to that of the pure Bi2Se3 film and not the Bi2Te3 film. This suggests
that the single Bi2Se3 QL layer on top of 19 QLs Bi2Te3 dominates its transport
properties, thus demonstrating surface transport. | | Source: | arXiv, 1308.5311 | | Services: | Forum | Review | PDF | Favorites | |
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