论文标题
在合作原子响应中的平均时间对称性和连贯的完美吸收
Parity-time symmetry and coherent perfect absorption in a cooperative atom response
论文作者
论文摘要
平等时代（$ \ Mathcal {pt} $）对称性已成为合成光学材料设计的重要概念，具有外在功能，例如单向运输和非重新反射。在特殊点，这种对称性自发折断，从具有保守强度的人转变为指数生长或衰减。在这里，我们分析了一个量子表面，该量子表面由阵列中的单层原子形成，并带有光介导强合作多体相互作用的光。我们展示了DeLabalized集体激发特征模式如何表现出有效的$ \ Mathcal {pt} $对称性和非指数衰减。这种有效的对称性是在被动系统中实现的，而不会通过平衡明亮模式的散射与次光黑暗模式的损失来实现。这些模式在特殊点结合，这是由相干吸收的出现出现的，其中相干传入的光被完美地吸收并仅散布着连贯的散布。我们还展示了$ \ Mathcal {pt} $对称性如何通过完全反射产生，并通过平衡集体模式的不同极性之间的散射和损失来生成。
Parity-Time ($\mathcal{PT}$) symmetry has become an important concept in the design of synthetic optical materials, with exotic functionalities such as unidirectional transport and non-reciprocal reflection. At exceptional points, this symmetry is spontaneously broken, and solutions transition from those with conserved intensity to exponential growth or decay. Here we analyze a quantum-photonic surface formed by a single layer of atoms in an array with light mediating strong cooperative many-body interactions. We show how delocalized collective excitation eigenmodes can exhibit an effective $\mathcal{PT}$ symmetry and non-exponential decay. This effective symmetry is achieved in a passive system without gain by balancing the scattering of a bright mode with the loss from a subradiant dark mode. These modes coalesce at exceptional points, evidenced by the emergence of coherent perfect absorption where coherent incoming light is perfectly absorbed and scattered only incoherently. We also show how $\mathcal{PT}$ symmetry can be generated in total reflection and by balancing scattering and loss between different polarizations of collective modes.
