论文标题
Bose系统临界动力学附近的量子相变
Bose system critical dynamics near quantum phase transition
论文作者
论文摘要
我们表明，由于QCP接近QCP的有效维度的增加，量子临界点（QCP）附近的波动光谱的变化可能导致临界指数随温度的持续变化。后者反映了从热波动的白噪声模式到量子波动方案的交叉。我们研究了使用Keldysh-Schwinger方法遵守Bose-Einstein的示例系统的临界动力学，并开发了重新归一化组技术，使我们能够获得关键指数温度依赖性的分析表达式。
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.
