Two-time correlation functions and the Lee-Yang zeros for an interacting Bose gas.

Gnatenko, Kh P; Kargol, A; Tkachuk, V M · Phys Rev E · 2017

basic_science · Level V

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Abstract

Two-time correlation functions of a system of Bose particles are studied. We find a relation of zeros of the correlation functions with the Lee-Yang zeros of the partition function of the system. The obtained relation gives the possibility to observe the Lee-Yang zeros experimentally. A particular case of Bose particles on two levels is examined, and zeros of two-time correlation functions and Lee-Yang zeros of the partition function of the system are analyzed.