308 research outputs found
Boundary energy of the general open XXZ chain at roots of unity
We have recently proposed a Bethe Ansatz solution of the open spin-1/2 XXZ
quantum spin chain with general integrable boundary terms (containing six free
boundary parameters) at roots of unity. We use this solution, together with an
appropriate string hypothesis, to compute the boundary energy of the chain in
the thermodynamic limit.Comment: 22 pages, 6 figures; v2: some comments, a reference and a footnote
adde
Finite-size correction and bulk hole-excitations for special case of an open XXZ chain with nondiagonal boundary terms at roots of unity
Using our solution for the open spin-1/2 XXZ quantum spin chain with N spins
and two arbitrary boundary parameters at roots of unity, the central charge and
the conformal dimensions for bulk hole excitations are derived from the 1/N
correction to the energy (Casimir energy).Comment: 21 pages, LaTeX, v2: minor changes and 3 references adde
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