Optical Traps for Dark Excitons
Optical Traps for Dark Excitons
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DOI：
10.1103/physrevlett.106.206404
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发表时间：
2011-05-20
影响因子：
8.6
通讯作者：
Piermarocchi, Carlo
中科院分区：
文献类型：
--
作者：
Combescot, Monique;Moore, Michael G.;Piermarocchi, Carlo
我们提出了一种利用线极化未吸收驻波捕获暗激子的机制，其潜在深度为几meV。由于这种基于载流子与未吸收光子耦合的虚激子交换的捕获，在亮态和暗态上同样起作用，因此在暗态下发生的玻色-爱因斯坦激子凝聚，当温度降低时，在阱势最小时，必然表现为亮激子云中的黑点。
We propose a mechanism for optical trapping of dark excitons by linearly polarized unabsorbed standing waves, with a potential depth of the order of a few meV. Since this trapping, based on carrier exchanges with virtual excitons coupled to unabsorbed photons, equally acts on bright and dark states, Bose-Einstein condensation of excitons-which occurs in dark states-must appear as dark spots in a cloud of bright excitons, at the trap potential minima, when the temperature decreases.