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hep-th2025
BC-type open spin chain
P. Antonenko, S. Derkachov, P. Valinevich
We diagonalize the -element of monodromy matrix for noncompact open spin chain with boundary interaction. The monodromy matrix is defined in terms of $SL(2,\m…
hep-th2018
Q-operator for the quantum NLS model
N. Belousov, S. Derkachov
In this paper we show that the operator introduced by A. A. Tsvetkov enjoys all the needed properties of a Q-operator. It is shown that the Q-operator of the XXX spin chain with ge…