Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum ballistic transport in in-plane-gate transistors showing onset
  of a novel ferromagnetic phase transition   We study one-dimensional transport in focused-ion-beam written in-plane-gate
transistors on III-V heterostructures at moderately low temperatures at zero
bias without any external magnetic field applied. In accordance with a recent
proposal of A. Gold and L. Calmels, Valley- and spin-occupancy instability in
the quasi-one-dimensional electron gas, Phil. Mag. Lett. 74, 33-42 (1996) and
earlier experimental data, we observe plateaux in the source-drain conductivity
considered as a function of the gate voltage, not only at multliples of 2e^2/h
but also clearly at e^2/h, just before the channel closes to zero conductivity.
This may be interpreted as a many electron effect, namely as a novel ballistic
ferromagnetic ground state evading standard descriptions and theorems.

17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph