Atomically Abrupt Topological p-n Junction
SCIE
SCOPUS
- Title
- Atomically Abrupt Topological p-n Junction
- Authors
- Kim, Sung Hwan; Jin, Kyung-Hwan; Kho, Byung Woo; Park, Byeong-Gyu; Liu, Feng; Kim, Jun Sung; Yeom, Han Woong
- Date Issued
- 2017-10
- Publisher
- AMER CHEMICAL SOC
- Abstract
- Topological insulators (TI's) are a new class of quantum matter with extraordinary surface electronic states, which bear great potential for spintronics and error-tolerant quantum computing. In order to put a TI into any practical use, these materials need to be fabricated into devices whose basic units are often p-n junctions. Unique electronic properties of a 'topological' p-n junction were proposed theoretically such as the junction electronic state and the spin rectification. However, the fabrication of a lateral topological p-n junction has been challenging because of materials, process, and fundamental reasons. Here, we demonstrate an innovative approach to realize a p-n junction of topological surface states (TSS's) of a three-dimensional (3D) topological insulator (TI) with an atomically abrupt interface. When a ultrathin Sb film is grown on a 3D TI of Bi2Se3 with a typical n-type TSS, the surface develops a strongly p-type TSS through the substantial hybridization between the 2D Sb film and the Bi2Se3 surface. Thus, the Bi2Se3 surface covered partially with Sb films bifurcates into areas of n- and p-type TSS's as separated by atomic step edges with a lateral electronic junction of as short as 2 nm. This approach opens a different avenue toward various electronic and spintronic devices based on well defined topological p-n junctions with the scalability down to atomic dimensions.
- Keywords
- EXPERIMENTAL REALIZATION; ELECTRONIC-STRUCTURE; BI(111) BILAYER; DIRAC CONE; INSULATOR; SURFACE; PHASE; HETEROSTRUCTURES; STATES; TRANSITION
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/91996
- DOI
- 10.1021/acsnano.7b03880
- ISSN
- 1936-0851
- Article Type
- Article
- Citation
- ACS Nano, vol. 11, no. 10, page. 9671 - 9677, 2017-10
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- There are no files associated with this item.
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