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Status of surface conduction in topological insulators
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10.When we say surface is more conducting or insulating than the bulk, we imply that the 3D resistivity of the surface layer is respectively, greater than or less than the bulk resistivity. The surface resistivity ρS is related to the surface resistance RS and to the thickness of surface layer tS by the relation ρS = RStS.
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29. Namrata Bansal
, Young Seung Kim
, Matthew Brahlek
, Eliav Edrey
, and Sheongshik Oh
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In this report, we scrutinize the thickness dependent resistivity data from the recent literature on electrical transport measurements in topological insulators. A linear increase in resistivity with increase in thickness is expected in the case of these materials since they have an insulating bulk and a conducting surface. However, such a trend is not seen in the resistivity versus thickness data for all the cases examined, except for some samples, where it holds for a range of thickness.
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