laser驱动的耗散非线性腔阵列中的超流体-绝缘体相变特征
Signatures of the super fluid-insulator phase transition in laser driven dissipative nonlinear cavity arrays
摘要：
研究了在脉冲相干场驱动下，耦合耗散非线性腔阵列中相互作用光子气体的非平衡动力学。使用平均场方法，我们表明，该系统表现出相变从莫特绝缘体的超流制度。对于给定的单光子非线性，发生相变的光子隧穿率的临界值随光子损失率的增加而增加。我们检查了过渡的鲁棒性，通过显示其对由脉冲激发制备的初始状态的不敏感性。我们发现，腔辐射的二阶相干性可以用来确定光学多体系统的相图，而不需要热化。
英文摘要：
We analyze the non-equilibrium dynamics of a gas of interacting photons in an array of coupled dissipative nonlinear cavities driven by a pulsed external coherent field. Using a mean-field approach, we show that the system exhibits a phase transition from a Mott-insulator-like to a superfluid regime. For a given single-photon nonlinearity, the critical value of the photon tunneling rate at which the phase transition occurs increases with the increasing photon loss rate. We checked the robustness of the transition by showing its insensitivity to the initial state prepared by the the pulsed excitation. We find that the second-order coherence of cavity emission can be used to determine the phase diagram of an optical many-body system without the need for thermalization.
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