Center for Theoretical Physics of Complex Systems, Institute for Basic Science, Daejeon, Republic of Korea.
Korea University of Science and Technology (UST), Daejeon 34113, Republic of Korea.
Sci Rep. 2017 Apr 3;7:45243. doi: 10.1038/srep45243.
We consider exciton-photon coupling in semiconductor microcavities in which separate periodic potentials have been embedded for excitons and photons. We show theoretically that this system supports degenerate ground-states appearing at non-zero inplane momenta, corresponding to multiple valleys in reciprocal space, which are further separated in polarization corresponding to a polarization-valley coupling in the system. Aside forming a basis for valleytronics, the multivalley dispersion is predicted to allow for spontaneous momentum symmetry breaking and two-mode squeezing under non-resonant and resonant excitation, respectively.
我们考虑了在半导体微腔中激子和光子分别嵌入了不同的周期势的激子-光子耦合。我们从理论上表明，该系统支持出现在非零面内动量的简并基态，对应于倒空间中的多个谷，这些谷在极化方向上进一步分离，对应于系统中的极化-谷耦合。除了为谷电子学提供基础外，多谷色散预计将允许在非共振和共振激发下分别实现自发动量对称破缺和双模压缩。
