Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-03-11
Phys. Rev. B 81, 241301(R)(2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pgs, 4 figs; title changed, minor text revision, references updated
Scientific paper
10.1103/PhysRevB.81.241301
While evidence of a topologically nontrivial surface state has been identified in surface-sensitive measurements of Bi2Se3, a significant experimental concern is that no signatures have been observed in bulk transport. In a search for such states, nominally undoped single crystals of Bi2Se3 with carrier densities approaching 10^16 cm^-3 and very high mobilities exceeding 2 m^2 V^-1 s^-1 have been studied. A comprehensive analysis of Shubnikov de Haas oscillations, Hall effect, and optical reflectivity indicates that the measured electrical transport can be attributed solely to bulk states, even at 50 mK at low Landau level filling factor, and in the quantum limit. The absence of a significant surface contribution to bulk conduction demonstrates that even in very clean samples, the surface mobility is lower than that of the bulk, despite its topological protection.
Butch Nicholas P.
Drew Dennis H.
Jenkins Gregory S.
Kirshenbaum Kevin
Paglione Johnpierre
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