Electrically tunable surface-to-bulk coherent coupling in topological insulator thin films

H. Steinberg*, J. B. Laloë, V. Fatemi, J. S. Moodera, P. Jarillo-Herrero

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

292 Scopus citations

Abstract

We study coherent electronic transport in charge-density-tunable microdevices patterned from thin films of the topological insulator (TI) Bi 2Se 3. The devices exhibit pronounced electric field effect, including ambipolar modulation of the resistance with an on-and-off ratio of 500%. We show that the weak antilocalization correction to conductance is sensitive to the number of coherently coupled channels, which in a TI includes the top and bottom surfaces and the bulk carriers. These are separated into coherently independent channels by the application of gate voltage and at elevated temperatures. Our results are consistent with a model where channel separation is determined by a competition between the phase coherence time and the surface-to-bulk scattering time.

Original languageAmerican English
Article number233101
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number23
DOIs
StatePublished - 5 Dec 2011
Externally publishedYes

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