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Response functions of gapped spin systems in high magnetic field

A. K. Kolezhuk, H. -J. Mikeska

cond-mat.str-elarXiv:cond-mat/0202171

Abstract

We study the dynamical structure factor of gapped one-dimensional spin systems in the critical phase in high magnetic field. It is shown that the presence of a ``condensate'' in the ground state in the high-field phase leads to interesting signatures in the response functions.

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