光诱导原子晶格宇称-时间对称性的观测
Observation of Parity-Time Symmetry in Optically Induced Atomic Lattices
摘要：
我们在一个相干制备的N型四能级原子系统中，实验研究了具有周期性增益和损耗分布的PT对称光晶格。通过适当地调整相关的原子参数，PT对称性破缺的开始观察到通过测量相邻的增益和损耗波导之间的相移突变。这种易于重构和有效可控的PT对称波导阵列结构的实验实现为进一步利用和更好地理解这些非厄米系统在原子环境中的特殊物理性质奠定了新的基础。
英文摘要：
We experimentally demonstrate PT-symmetric optical lattices with periodical gain and loss profiles in a coherently-prepared four-level N-type atomic system. By appropriately tuning the pertinent atomic parameters, the onset of PT-symmetry breaking is observed through measuring an abrupt phase-shift jump between adjacent gain and loss waveguides. The experimental realization of such readily reconfigurable and effectively controllable PT-symmetric waveguide array structure sets a new stage for further exploiting and better understanding the peculiar physical properties of these non-Hermitian systems in atomic settings.
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