Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Deconfined Quantum Criticality and Conformal Phase Transition in
  Two-Dimensional Antiferromagnets   Deconfined quantum criticality of two-dimensional $SU(2)$ quantum
antiferromagnets featuring a transition from an antiferromagnetically ordered
ground state to a so-called valence-bond solid state, is governed by a
non-compact CP$^1$ model with a Maxwell term in 2+1 spacetime dimensions. We
introduce a new perspective on deconfined quantum criticality within a
field-theoretic framework based on an expansion in powers of $\epsilon=4-d$ for
fixed number $N$ of complex matter fields. We show that in the allegedly weak
first-order transition regime, a so-called conformal phase transition leads to
a genuine deconfined quantum critical point. In such a transition, the gap
vanishes when the critical point is approached from above and diverges when it
is approached from below. We also find that the spin stiffness has a universal
jump at the critical point.

12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom