Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low-Temperature Collapse of Electron Localisation in Two Dimensions   We report direct experimental evidence that the insulating phase of a
disordered, yet strongly interacting two-dimensional electron system (2DES)
becomes unstable at low temperatures. As the temperature decreases, a
transition from insulating to metal-like transport behaviour is observed, which
persists even when the resistivity of the system greatly exceeds the quantum of
resistivity h/e^2. The results have been achieved by measuring transport on a
mesoscopic length-scale while systematically varying the strength of disorder.

11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org