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Infinite matrix product states, boundary conformal field theory, and the open Haldane-Shastry model

Abstract

We show that infinite Matrix Product States (MPS) constructed from conformal field theories can describe ground states of one-dimensional critical systems with open boundary conditions. To illustrate this, we consider a simple infinite MPS for a spin-1/2 chain and derive an inhomogeneous open Haldane-Shastry model. For the spin-1/2 open Haldane-Shastry model, we derive an exact expression for the two-point spin correlation function. We also provide an SU(nn) generalization of the open Haldane-Shastry model and determine its twisted Yangian generators responsible for the highly degenerate multiplets in the energy spectrum.Comment: 5+7 pages, 4 figures, published version, a typo in the twisted Yangian generators corrected (thanks to the authors of arXiv:1511.08613 for pointing out this typo

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