论文标题
MOS $ _2 $激子的耦合与晶格声子和腔振动声子混合纳米腔腔
Coupling of MoS$_2$ Excitons with Lattice Phonons and Cavity Vibrational Phonons in Hybrid Nanobeam Cavities
论文作者
论文摘要
我们报告了中性激子的共振拉曼光谱X $^0 $和Intravalley Trions x $^ - $ in hbn已封装的MOS $ _2 $单层嵌入纳米孔腔中。通过温度调整MOS $ _2 $晶格声子和X $^0 $/X $^ - $发射峰之间的拉曼模式之间的不沟，我们探测了激子，晶格声子和空腔振动声子的相互耦合。我们观察到X $^0 $诱导的拉曼散射的增强和X $^ - $ - 诱导的抑制作用，并解释了我们的发现，这是由三方激子 - Phonon-Phonon-Phonon耦合引起的。空腔振动声子为晶格声子散射的共振条件提供了X $^0 $的中间副本状态，从而增强了拉曼强度。相反，发现涉及X $^ - $的三方耦合被发现弱得多，这是通过电子和孔变形电位的几何相关极性来解释的。我们的结果表明，晶格和纳米力学模式之间的语音杂交在2D材料纳米光子系统中的兴奋性光体物理和光 - 物理相互作用中起关键作用。
We report resonant Raman spectroscopy of neutral excitons X$^0$ and intravalley trions X$^-$ in hBN-encapsulated MoS$_2$ monolayer embedded in a nanobeam cavity. By temperature tuning the detuning between Raman modes of MoS$_2$ lattice phonons and X$^0$/X$^-$ emission peaks, we probe the mutual coupling of excitons, lattice phonons and cavity vibrational phonons. We observe an enhancement of X$^0$-induced Raman scattering and a suppression for X$^-$-induced, and explain our findings as arising from the tripartite exciton-phonon-phonon coupling. The cavity vibrational phonons provide intermediate replica states of X$^0$ for resonance conditions in the scattering of lattice phonons, thus enhancing the Raman intensity. In contrast, the tripartite coupling involving X$^-$ is found to be much weaker, an observation explained by the geometry-dependent polarity of the electron and hole deformation potentials. Our results indicate that phononic hybridization between lattice and nanomechanical modes plays a key role in the excitonic photophysics and light-matter interaction in 2D-material nanophotonic systems.
