恒温双量子交换中准自旋系统相变的特异性
Specificity of Phase Transition of Quasi-Spin System in Two-Quantum Exchange with Thermostat
摘要：
研究了N个辐射体系统在双光子与腔场交换作用下的量子相变。结果表明，对于该系统，原子-场交换积分随温度的升高而增大。这种效应在相变图像中产生特殊性。与传统的准自旋系统的二级相变相比，准自旋之间的非线性交换过程导致了临界温度的升高。
英文摘要：
The quantum phase transition of the system of N radiators in case of two-photon exchange interaction with cavity electromagnetic field is considered. It is shown that for this system the atom-field exchange integral increases with the increase of temperature. This effect generates peculiarities in phase transition picture. The process of nonlinear exchange between the quasi-spins leads to the increase of critical temperature as compared to traditional second order phase transition of quasi-spin system.
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