Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: "Scaling of an anomalous metal/insulator transition in a 2D system in
  silicon at zero magnetic field"   We have studied the temperature dependence of resistivity, $\rho$, for a
two-dimensional electron system in silicon at low electron densities,
$n_s\sim10^{11}$ cm$^{-2}$, near the metal/insulator transition. The
resistivity was empirically found to scale with a single parameter, $T_0$,
which approaches zero at some critical electron density, $n_c$, and increases
as a power $T_0\propto|n_s-n_c|^\beta$ with $\beta=1.6\pm0.1$ both in metallic
($n_s>n_c$) and insulating ($n_s<n_c$) regions. This dependence was found to be
sample-independent. We have also studied the diagonal resistivity at Landau
level filling factor $\nu=3/2$ where the system is known to be in a metallic
state at high magnetic field and in an insulating state at low magnetic field.
The temperature dependencies of resistivity at $B=0$ and at $\nu=3/2$ were
found to be identical. These behaviors suggest a true metal/insulator
transition in the two dimensional electron system in silicon at $B=0$, in
contrast with the well-known scaling theory.

9
The categories of this paper are: nlin
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
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The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: econ
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The categories of this paper are: astro-ph
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The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph