Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin chains with boundary inhomogeneities   We investigate the effect of introducing a boundary inhomogeneity in the
transfer matrix of an integrable open quantum spin chain. We find that it is
possible to construct a local Hamiltonian, and to have quantum group symmetry.
The boundary inhomogeneity has a profound effect on the Bethe ansatz solution.

1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph