Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-09-13
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 4 figures, 1 table
Scientific paper
A topological insulator is a new state of matter, possessing gapless spin-locking surface states across the bulk band gap which has created new opportunities from novel electronics to energy conversion. However, the large concentration of bulk residual carriers has been a major challenge for revealing the property of the topological surface state via electron transport measurement. Here we report surface state dominated transport in Sb-doped Bi2Se3 nanoribbons with very low bulk electron concentrations. In the nanoribbons with sub-10nm thickness protected by a ZnO layer, we demonstrate complete control of their top and bottom surfaces near the Dirac point, achieving the lowest carrier concentration of 2x10^11/cm2 reported in three-dimensional (3D) topological insulators. The Sb-doped Bi2Se3 nanostructures provide an attractive materials platform to study fundamental physics in topological insulators, as well as future applications.
Cha Judy J.
Cui Yi
Hong Seung Sae
Kong Desheng
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