Journal
NANO LETTERS
Volume 14, Issue 7, Pages 3755-3760Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl501489m
Keywords
Topological insulators; Bi2Te2Se; nanoscale four-point probe; angle-resolved photoemission; scanning tunneling spectroscopy
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Funding
- Carlsberg foundation
- VILLUM foundation
- Danish National Research Foundation [DNRF93]
- Capres A/S
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Topological insulators are guaranteed to support metallic surface states on an insulating bulk, and one should thus expect that the electronic transport in these materials is dominated by the surfaces states. Alas, due to the high remaining bulk conductivity, it is challenging to achieve surface-dominated transport. Here we use nanoscale four-point setups with a variable contact distance on an atomically clean surface of bulk-insulating Bi2Te2Se. We show that the transport at 30 K is two-dimensional rather than three-dimensional, that is, surface-dominated, and we find a surface state mobility of 390(30) cm(2) V-1 s(-1) at 30 K at a carrier concentration of 8.71(7) x 10(12) cm(-2).
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