Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Local susceptibilities in semi-infinite antiferromagnet chains:
  elementary perspectives   Using conformal field theory methods Eggert and Affleck have shown that the
semi-infinite S=1/2 Heisenberg antiferromagnetic chain exhibits a remarkable
alternation in its local response to a uniform field at low temperatures. Such
alternation is not an essentially quantum effect: similar, and sometimes
stronger, susceptibility alternation is a feature of classical Heisenberg-Ising
chains at T=0. In S=1/2 chains, susceptibility alternation is not unique to the
Heisenberg model, but can be seen in expansions about the Ising model and also
in the XY model.

14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio