论文标题
TMD北极星的可调光学非线性穿着费米海
Tunable optical nonlinearity for TMD polaritons dressed by a Fermi sea
论文作者
论文摘要
我们研究了放置在光学谐振器中的过渡金属二甲化合物（TMD）单层的系统，在该系统中，激光偶联得以实现激光和光子之间的强烈耦合。我们介绍了掺杂TMD单层的激子 - 孔子的非线性光学响应的定量理论，并详细分析了两个非线性的来源。第一个非线性响应贡献源于激子之间的库仑交换相互作用。第二个贡献来自于在激子浓度增加的相位空间填充和激子的复合性质下填充的狂犬分裂的降低。我们证明，在自由电子的存在下，这两种非线性贡献都得到了增强。由于可以通过外部施加的门电压常规控制游离电子浓度，因此这打开了一种非线性光学响应的电气调谐方式。
We study a system of a transition metal dichalcogenide (TMD) monolayer placed in an optical resonator, where strong light-matter coupling between excitons and photons is achieved. We present quantitative theory of the nonlinear optical response for exciton-polaritons for the case of doped TMD monolayer, and analyze in detail two sources of nonlinearity. The first nonlinear response contribution stems from the Coulomb exchange interaction between excitons. The second contribution comes from the reduction of Rabi splitting that originates from phase space filling at increased exciton concentration and the composite nature of excitons. We demonstrate that both nonlinear contributions are enhanced in the presence of free electrons. As free electron concentration can be routinely controlled by an externally applied gate voltage, this opens a way of electrical tuning of the nonlinear optical response.
