Theory of optically controlled anisotropic polariton transport in semiconductor double microcavities
Theory of optically controlled anisotropic polariton transport in semiconductor double microcavities
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DOI：
10.1364/josab.35.000146
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发表时间：
2017-05
影响因子：
1.9
通讯作者：
S. Luk;P. Lewandowski;N. Kwong;E. Baudin;O. Lafont;J. Tignon;P. Leung;Chiu-wah Chan;M. Babilon;S. Schumacher;R. Binder
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作者：
S. Luk;P. Lewandowski;N. Kwong;E. Baudin;O. Lafont;J. Tignon;P. Leung;Chiu-wah Chan;M. Babilon;S. Schumacher;R. Binder
半导体微腔中的激子极化子表现出许多基本的物理效应，其中一些可以被外场控制。极化子输运受到横向电模式和横向磁模式分裂引起的极化子自旋轨道相互作用的影响。这是极化霍尔效应的基础，称为光自旋霍尔效应（OSHE），它与动量空间中自旋/极化织构的形成有关，决定了各向异性弹道输运，以及实际空间中的相关织构。由于极化子的激子组分之间的库仑相互作用，极化子的光激发可以影响OSHE。我们提出了半导体双微腔中OSHE及其光学控制的理论分析，即两个光耦合腔，特别适合于产生影响自旋织构形成的极化子的极化子储层。该理论是用一组双腔旋极子Gross-Pitaevskii方程表述的。数值解的特点之一是在动量空间中控制自旋纹理的旋转。该理论还允许识别有效磁场分量，该分量根据激子相互作用和第二低极化子分支的极化子密度确定现象学伪自旋模型中的光学控制。
Exciton polaritons in semiconductor microcavities exhibit many fundamental physical effects, with some of them amenable to being controlled by external fields. The polariton transport is affected by the polaritonic spin–orbit interaction, which is caused by the splitting of transverse-electric and transverse-magnetic modes. This is the basis for a polaritonic Hall effect, called the optical spin Hall effect (OSHE), which is related to the formation of spin/polarization textures in momentum space, determining anisotropic ballistic transport, as well as related textures in real space. Owing to Coulombic interactions between the excitonic components of the polaritons, optical excitation of polaritons can affect the OSHE. We present a theoretical analysis of the OSHE and its optical control in semiconductor double microcavities, i.e., two optically coupled cavities, which are particularly well suited for the creation of polaritonic reservoirs that affect the spin-texture-forming polaritons. The theory is formulated in terms of a set of double-cavity spinor-polariton Gross–Pitaevskii equations. Numerical solutions feature, among other things, a controlled rotation of the spin texture in momentum space. The theory also allows for an identification of the effective magnetic field component that determines the optical control in phenomenological pseudo-spin models in terms of exciton interactions and the polariton density in the second lower polariton branch.