Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bloch Electron on a Triangular Lattice and Quantum Ising Model in a
  Transverse Field   The tight binding model for an electron on an anisotropic triangular lattice
in a uniform magnetic field is studied using a decimation scheme. The model
exhibits a transition from critical to localized phase and the phase diagram is
described in terms of three nontrivial renormalization fixed points for the
band edges. These subcritical, critical, and supercritical universality classes
also describe the corresponding states of the quantum Ising chain in a
modulating transverse field. The only exception is the conformally invariant
point of the Ising model which has no analog in the electron problem.

20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th