Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Phase Transition in a Clean Two-Dimensional Electron System   A quantum phase transition that was recently observed in a high-mobility
silicon MOSFET is analyzed in terms of a scaling theory. The most striking
characteristic of the transition is a divergence of the thermopower, according
to an inverse linear law, as a critical value of the electron density is
approached. A scaling description of this transition yields predictions about
the critical behavior of other observables, e.g., the specific heat. We also
explore the possibility that this transition realizes a recently predicted
transition from a Fermi liquid to a non-Fermi-liquid state.

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The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph