On the Functional Integral Theory of Systems with Kinematical Interaction

Abstract

We propose a systematic way to investigate the low-temperature thermodynamic properties of quantum spin systems subject to the restriction that only a finite number of bosons may occupy a single lattice site. Such a kinematical interaction results in appearance of a temperature dependent chemical potential. Its low-temperature asymptotics is calculated self-consistently using the functional integration technique.Comment: 3 pages (REVTeX), 2 PS figure