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Paper detail

Suppressing twin formation in Bi2Se3 thin films

The microstructure of Bi2Se3 topological-insulator thin films grown by molecular beam epitaxy on InP(111)A and InP(111)B substrates that have different surface roughnesses has been studied in detail using X-ray diffraction, X-ray reflectivity, atomic force microscopy and probe-corrected scanning transmission electron microscopy. The use of a rough Fe-doped InP(111)B substrate results in complete suppression of twin formation in the Bi2Se3 thin films and a perfect interface between the films and their substrates. The only type of structural defects that persist in the "twin-free" films is an antiphase domain boundary, which is associated with variations in substrate height. It is also shown that the substrate surface termination determines which family of twin domains dominates.

preprint2015arXivOpen access
N. V. TarakinaS. SchreyeckM. LuysbergS. GrauerC. SchumacherG. KarczewskiK. BrunnerC. GouldH. BuhmannR. E. Dunin-BorkowskiL. W. Molenkamp
cond-mat.mtrl-sci
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N. V. TarakinaS. SchreyeckM. LuysbergS. GrauerC. SchumacherG. KarczewskiK. BrunnerC. GouldH. BuhmannR. E. Dunin-BorkowskiL. W. Molenkamp

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