Abstract:
:In spite of much work on topological insulators (TIs), systematic experiments for TI/TI heterostructures remain absent. 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 QLs Bi2Se3 and different with that of the 20 QLs Bi2Te3. In ex situ transport measurements, the observed linear magnetoresistance (MR) and weak antilocalization (WAL) of the hybrid heterostructure are similar to that of the pure Bi2Se3 film and not the Bi2Te3 film. This suggests that the single Bi2Se3 layer on top of 19 QLs Bi2Te3 dominates its transport properties.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Zhao Y,Chang CZ,Jiang Y,DaSilva A,Sun Y,Wang H,Xing Y,Wang Y,He K,Ma X,Xue QK,Wang Jdoi
10.1038/srep03060subject
Has Abstractpub_date
2013-10-28 00:00:00pages
3060issn
2045-2322pii
srep03060journal_volume
3pub_type
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