Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-04-06
Phys. Rev. B 83, 241304(R) (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 3 figures. For comments and questions, please contact: yqli@iphy.ac.cn
Scientific paper
10.1103/PhysRevB.83.241304
We demonstrate that the weak antilocalization effect can serve as a convenient method for detecting decoupled surface transport in topological insulator thin films. In the regime where a bulk Fermi surface coexists with the surface states, the low field magnetoconductivity is described well by the Hikami-Larkin-Nagaoka equation for single component transport of non-interacting electrons. When the electron density is lowered, the magnetotransport behavior deviates from the single component description and strong evidence is found for independent conducting channels at the bottom and top surfaces. The magnetic-field-dependent part of corrections to conductivity due to the Zeeman energy is shown to be negligible despite non-negligible electron-electron interactions.
Chen Jiahua
He X. Y.
Ji Z. Q.
Li You-Quan
Lu Linyuan
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