Subradiance-protected excitation transport
Subradiance-protected excitation transport
复制标题
亚辐射保护激发传输
DOI：
10.1088/1367-2630/ab31e8
复制
发表时间：
2019
影响因子：
3.3
通讯作者：
Needham J
中科院分区：
文献类型：
--
作者：
Needham J
我们探索一维原子链内的激发传输，其中原子跃迁偶极子与自由辐射场耦合。当原子之间的距离小于或等于跃迁波长时，虚拟光子的交换导致激发通过晶格传输。尽管这是一个强耗散系统，但我们发现输运是次辐射的，也就是说，激发寿命比单个原子的激发寿命长几个数量级。特别是，我们表明光谱的子空间是由具有线性色散关系的次辐射态形成的，这允许波包以几乎零衰减率长距离无色散传输。此外，传输的群速度和方向可以通过外部均匀磁场控制，同时保持其次辐射特性。该系统的简单性和多功能性，以及亚辐射对无序的鲁棒性，使其适用于无损能量传输和长时间光存储等一系列应用。
We explore excitation transport within a one-dimensional chain of atoms where the atomic transition dipoles are coupled to the free radiation field. When the atoms are separated by distances smaller or comparable to the wavelength of the transition, the exchange of virtual photons leads to the transport of the excitation through the lattice. Even though this is a strongly dissipative system, we find that the transport is subradiant, that is, the excitation lifetime is orders of magnitude longer than the one of an individual atom. In particular, we show that a subspace of the spectrum is formed by subradiant states with a linear dispersion relation, which allows for the dispersionless transport of wave packets over long distances with virtually zero decay rate. Moreover, the group velocity and direction of the transport can be controlled via an external uniform magnetic field while preserving its subradiant character. The simplicity and versatility of this system, together with the robustness of subradiance against disorder, makes it relevant for a range of applications such as lossless energy transport and long-time light storage.
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影响因子：
12.5
作者：
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通讯作者：
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影响因子：
8.6
作者：
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近表面原子系综中改进的偶极子相互作用和耗散
影响因子：
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通讯作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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