期刊
NANO LETTERS
卷 13, 期 12, 页码 6064-6069出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl403312y
关键词
Topological insulators; electronic structure; heterostructures; electric field
类别
资金
- Ministry of Education and Science of the Russian Federation [2.8575.2013]
- Federal Targeted Program Scientific and scientific-pedagogical personnel of innovative Russia [14.B37.21.1164]
- Russian Foundation for Basic Research [13-02-12110 ofi_m]
- German Research Foundation (DFG) [ER 340/4-1, 1666]
The ability to engineer an electronic band structure of topological insulators would allow the production of topological materials with tailor-made properties. Using ab initio calculations, we show a promising way to control the conducting surface state in topological insulator based heterostructures representing an insulator ultrathin films on the topological insulator substrates. Because of a specific relation between work functions and band gaps of the topological insulator substrate and the insulator ultrathin film overlayer, a sizable shift of the Dirac point occurs resulting in a significant increase in the number of the topological surface state charge carriers as compared to that of the substrate itself. Such an effect can also be realized by applying the external electric field that allows a gradual tuning of the topological surface state. A simultaneous use of both approaches makes it possible to obtain a topological insulator based heterostructure with a highly tunable topological surface state.
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