Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pseudo-spin canting transition in bilayer quantum Hall ferromagnets: a
  self-charging capacitor   For sufficiently strong in-plane magnetic field a $\nu_T=1$ bilayer quantum
Hall pseudo-ferromagnet is expected to exhibit a soliton lattice. For
sufficiently close layers and large in-plane field, we predict this
incommensurate ``planar'' phase $P_I$ to undergo a reentrant pseudo-spin
canting transition to an incommensurate state $C_I$, with a finite out-of-plane
pseudo-magnetization component, corresponding to an interlayer charge imbalance
in regions between solitons. At $T>0$ the transition is in the 2d compressible
Ising universality class, and at T=0, the quantum transition is in heretofore
unexplored universality class. The striking experimental signatures are the
universal nonlinear charge-voltage and in-plane field relations, and the
divergence of the differential bilayer capacitance at the transition, resulting
in a bilayer capacitor that spontaneously charges itself, even in the absence
of an applied interlayer voltage.

11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph