Quantum oscillations and hall anomaly of surface states in the topological insulator Bi2Te3

Dong Xia Qu, Y. S. Hor, Jun Xiong, Robert Joseph Cava, Nai Phuan Ong

Research output: Contribution to journalArticle

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Abstract

Topological insulators are insulating materials that display massless, Dirac-like surface states in which the electrons have only one spin degree of freedom on each surface. These states have been imaged by photoemission, but little information on their transport parameters, for example, mobility, is available. We report the observation of Shubnikov - de Haas oscillations arising from the surface states in nonmetallic crystals of Bi2Te 3. In addition, we uncovered a Hall anomaly in weak fields, which enables the surface current to be seen directly. Both experiments yield a surface mobility (9000 to 10,000 centimeter2 per volt-second) that is substantially higher than in the bulk. The Fermi velocity of 4 × 10 5 meters per second obtained from these transport experiments agrees with angle-resolved photoemission experiments.

Original languageEnglish (US)
Pages (from-to)821-824
Number of pages4
JournalScience
Volume329
Issue number5993
DOIs
StatePublished - Aug 13 2010

All Science Journal Classification (ASJC) codes

  • General

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