多阈值二级相变
Multi-threshold second-order phase transition
摘要：
提出了多阈值二级相变理论，并在实验上证实了多阈值二级相变现象。在外腔半导体激光器系统中，通过精心选择参数，在测量的功率-电流-温度三维相图中观察到了具有多个（三个或四个）阈值的二级相变。这种受控的二级相变的死亡和复活为普遍存在的二级相变的本质提供了新的见解。我们的理论和实验表明，单阈值二级相变只是更普遍的多阈值二级相变的一个特例，而多阈值二级相变是一个更丰富的现象。
英文摘要：
We present a theory of the multi-threshold second-order phase transition, and experimentally demonstrate the multi-threshold second-order phase transition phenomenon. With carefully selected parameters, in an external cavity diode laser system, we observe second-order phase transition with multiple (three or four) thresholds in the measured power-current-temperature three dimensional phase diagram. Such controlled death and revival of second-order phase transition sheds new insight into the nature of ubiquitous second-order phase transition. Our theory and experiment show that the single threshold second-order phase transition is only a special case of the more general multi-threshold second-order phase transition, which is an even richer phenomenon.
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