DOI: 10.1063/10.0031958 ISSN: 0360-0335
Canonical variables and virial theorem for a crystal with two-level impurity systems
Yu. G. Pogorelov, M. A. Ivanov, V. M. LoktevA canonical formalism for two-level systems (TLS) is constructed and the virial theorem is generalized for a crystal with impurity TLS by using the Grassmann anticommuting variables method. This provides a convenient way for studying the thermodynamics of such systems.