Bose system critical dynamics near quantum phase transition
Statistical Mechanics
2021-06-02 v2 Quantum Physics
Abstract
We show that the change of the fluctuation spectrum near the quantum critical point (QCP) may result in the continuous change of critical exponents with temperature due to the increase in the effective dimensionality upon approach to QCP. The latter reflects the crossover from thermal fluctuations white noise mode to the quantum fluctuations regime. We investigate the critical dynamics of an exemplary system obeying the Bose-Einstein employing the Keldysh-Schwinger approach and develop the renormalization group technique that enables us to obtain analytical expressions for temperature dependencies of critical exponents.
Cite
@article{arxiv.2004.14086,
title = {Bose system critical dynamics near quantum phase transition},
author = {M. G. Vasin and V. M. Vinokur},
journal= {arXiv preprint arXiv:2004.14086},
year = {2021}
}