3 years ago

Atomically Abrupt Topological p–n Junction

Atomically Abrupt Topological p–n Junction
Han Woong Yeom, Byeong-Gyu Park, Kyung-Hwan Jin, Feng Liu, Sung Hwan Kim, Byung Woo Kho, Jun Sung Kim
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. Interesting 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.

Publisher URL: http://dx.doi.org/10.1021/acsnano.7b03880

DOI: 10.1021/acsnano.7b03880

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.