Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low-energy spectra in the t-J type models at light doping   Based on a variational approach, we propose that there are two kinds of low
energy states in the t-J type models at low doping. In a quasi-particle state
an unpaired spin bound to a hole with a well-defined momentum can be excited
with spin waves. The resulting state shows a suppression of antiferromagnetic
order around the hole with the profile of a {\em spin bag}. These spin-bag
states with spin and charge or hole separated form a continuum of low-energy
excitations. Very different properties predicted by these two kinds of states
explain a number of anomalous results observed in the exact diagonalization
studies on small clusters up to 32 sites.

26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio