Topological quantum well resonances in metal overlayers

Xiaoxiong Wang; Guang Bian; T. Miller; T. C. Chiang

doi:10.1103/PhysRevB.87.235113

Topological quantum well resonances in metal overlayers

Xiaoxiong Wang, Guang Bian, T. Miller, T. C. Chiang

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

The electronic structure of thin Ca/Sr alloy films epitaxially grown on the topological insulator Bi₂Se₃ is investigated by first-principles calculations. Despite a negligible spin-orbit coupling in Ca/Sr alloys and strict spin degeneracy in freestanding Ca/Sr films, the topological surface states on the pristine Bi₂Se₃ surface are spatially transferred, upon Ca/Sr overlayer growth, into the overlayer to form topological quantum well resonances characterized by a spin-polarized chiral Dirac cone. The physical origin of this effect and the implications regarding applications are discussed.

Original language	English
Article number	235113
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	87
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevB.87.235113
State	Published - Jun 12 2013
Externally published	Yes

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10.1103/PhysRevB.87.235113

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abstract = "The electronic structure of thin Ca/Sr alloy films epitaxially grown on the topological insulator Bi2Se3 is investigated by first-principles calculations. Despite a negligible spin-orbit coupling in Ca/Sr alloys and strict spin degeneracy in freestanding Ca/Sr films, the topological surface states on the pristine Bi2Se3 surface are spatially transferred, upon Ca/Sr overlayer growth, into the overlayer to form topological quantum well resonances characterized by a spin-polarized chiral Dirac cone. The physical origin of this effect and the implications regarding applications are discussed.",

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AU - Chiang, T. C.

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AB - The electronic structure of thin Ca/Sr alloy films epitaxially grown on the topological insulator Bi2Se3 is investigated by first-principles calculations. Despite a negligible spin-orbit coupling in Ca/Sr alloys and strict spin degeneracy in freestanding Ca/Sr films, the topological surface states on the pristine Bi2Se3 surface are spatially transferred, upon Ca/Sr overlayer growth, into the overlayer to form topological quantum well resonances characterized by a spin-polarized chiral Dirac cone. The physical origin of this effect and the implications regarding applications are discussed.

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Topological quantum well resonances in metal overlayers

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