Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-04-07
Physical Review B, 84, 233101 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
10.1103/PhysRevB.84.233101
We study coherent transport in density tunable micro-devices patterned from thin films of the topological insulator (TI) Bi2Se3. The devices exhibit pronounced electric field effect, including ambipolar modulation of the resistance with an on/off ratio of 500%. We show that the weak antilocalization (WAL) correction to conductance is sensitive to the number of coherently coupled channels, which in a TI includes the top and bottom surface 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 coherence time and surface-bulk scattering time.
Fatemi Valla
Jarillo-Herrero Pablo
Laloë Jean-Baptiste
Moodera Jagadeesh S.
Steinberg Hadar
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