Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Influence of Device Geometry on Transport Properties of Topological
  Insulator Microflakes   In the transport studies of topological insulators, microflakes exfoliated
from bulk single crystals are often used because of the convenience in sample
preparation and the accessibility to high carrier mobilities. Here, based on
finite element analysis, we show that for the non-Hall-bar shaped topological
insulator samples, the measured four-point resistances can be substantially
modified by the sample geometry, bulk and surface resistivities, and magnetic
field. Geometry correction factors must be introduced for accurately converting
the four-point resistances to the longitudinal resistivity and Hall
resistivity. The magnetic field dependence of inhomogeneous current density
distribution can lead to pronounced positive magnetoresistance and nonlinear
Hall effect that would not exist in the samples of ideal Hall bar geometry.

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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: astro-ph
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: q-bio
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The categories of this paper are: nlin
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: chao-dyn