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Anomalous Behaviors of Quantum Emitters in Non-Hermitian Baths
Physical Review Letters ( IF 8.6 ) Pub Date : 2022-11-23 , DOI: 10.1103/physrevlett.129.223601
Zongping Gong 1, 2 , Miguel Bello 1, 2 , Daniel Malz 1, 2 , Flore K Kunst 1, 2, 3
Affiliation  

Both non-Hermitian systems and the behavior of emitters coupled to structured baths have been studied intensely in recent years. Here, we study the interplay of these paradigmatic settings. In a series of examples, we show that a single quantum emitter coupled to a non-Hermitian bath displays a number of unconventional behaviors, many without Hermitian counterpart. We first consider a unidirectional hopping lattice whose complex dispersion forms a loop. We identify peculiar bound states inside the loop as a manifestation of the non-Hermitian skin effect. In the same setting, emitted photons may display spatial amplification markedly distinct from free propagation, which can be understood with the help of the generalized Brillouin zone. We then consider a nearest-neighbor lattice with alternating loss. We find that the long-time emitter decay always follows a power law, which is usually invisible for Hermitian baths. Our Letter points toward a rich landscape of anomalous quantum emitter dynamics induced by non-Hermitian baths.

中文翻译:

非厄密浴中量子发射器的反常行为

近年来,对非厄尔米特系统和耦合到结构化浴的发射器的行为进行了深入研究。在这里,我们研究了这些范式设置的相互作用。在一系列示例中,我们展示了耦合到非厄米浴槽的单个量子发射器显示出许多非常规行为,其中许多行为没有厄米特对应物。我们首先考虑一个单向跳跃晶格,其复杂的色散形成一个环路。我们将环路内的特殊束缚态识别为非厄尔米特集肤效应的表现。在相同的设置中,发射的光子可能显示出明显不同于自由传播的空间放大,这可以借助广义布里渊区来理解。然后我们考虑具有交替损失的最近邻点阵。我们发现长时间的发射器衰减总是遵循幂律,这对于厄尔米特浴通常是不可见的。我们的信指出了由非厄尔米特浴引起的异常量子发射体动力学的丰富景观。
更新日期:2022-11-23
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