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Topologization of ?-antimonene on Bi2Se3 via proximity effects.

ABSTRACT: Topological surface states usually emerge at the boundary between a topological and a conventional insulator. Their precise physical character and spatial localization depend on the complex interplay between the chemical, structural and electronic properties of the two insulators in contact. Using a lattice-matched heterointerface of single and double bilayers of ?-antimonene and bismuth selenide, we perform a comprehensive experimental and theoretical study of the chiral surface states by means of microscopy and spectroscopic measurements complemented by first-principles calculations. We demonstrate that, although ?-antimonene is a trivial insulator in its free-standing form, it inherits the unique symmetry-protected spin texture from the substrate via a proximity effect that induces outward migration of the topological state. This "topologization" of ?-antimonene is found to be driven by the hybridization of the bands from either side of the interface.

SUBMITTER: Holtgrewe K 

PROVIDER: S-EPMC7471962 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature

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Topologization of β-antimonene on Bi<sub>2</sub>Se<sub>3</sub> via proximity effects.

Holtgrewe K K   Mahatha S K SK   Sheverdyaeva P M PM   Moras P P   Flammini R R   Colonna S S   Ronci F F   Papagno M M   Barla A A   Petaccia L L   Aliev Z S ZS   Babanly M B MB   Chulkov E V EV   Sanna S S   Hogan C C   Carbone C C  

Scientific reports 20200903 1

Topological surface states usually emerge at the boundary between a topological and a conventional insulator. Their precise physical character and spatial localization depend on the complex interplay between the chemical, structural and electronic properties of the two insulators in contact. Using a lattice-matched heterointerface of single and double bilayers of β-antimonene and bismuth selenide, we perform a comprehensive experimental and theoretical study of the chiral surface states by means  ...[more]

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