Ultra-low carrier concentration and surface-dominant transport in antimony-doped Bi₂Se₃ topological insulator nanoribbons.

Abstract:

:A topological insulator is the state of quantum 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 by electron transport measurements. Here we report the surface-state-dominant transport in antimony-doped, zinc oxide-encapsulated Bi(2)Se(3) nanoribbons with suppressed bulk electron concentration. In the nanoribbon with sub-10-nm thickness protected by a zinc oxide layer, we position the Fermi levels of the top and bottom surfaces near the Dirac point by electrostatic gating, achieving extremely low two-dimensional carrier concentration of 2×10(11) cm(-2). The zinc oxide-capped, antimony-doped Bi(2)Se(3) nanostructures provide an attractive materials platform to study fundamental physics in topological insulators, as well as future applications.

journal_name

Nat Commun

journal_title

Nature communications

authors

Hong SS,Cha JJ,Kong D,Cui Y

doi

10.1038/ncomms1771

subject

Has Abstract

pub_date

2012-03-27 00:00:00

pages

757

issn

2041-1723

pii

ncomms1771

journal_volume

3

pub_type

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