论文标题
WSE $ _2 $/MO $ $ $ _ {0.5} $ W $ _ {0.5} $ se $ se $ _2 $ heterobilayer通过调谐场近场腔的动力控制
Dynamical Control of Interlayer Excitons and Trions in WSe$_2$/Mo$_{0.5}$W$_{0.5}$Se$_2$ Heterobilayer via Tunable Near-Field Cavity
论文作者
论文摘要
过渡金属二甲化物（TMD）杂波中新兴的光诱导的兴奋性过程，例如，耦合，dephasing和层间和间层中的激子的能量传递，为超平蛋白光子设备提供了新的机会。然而，鉴于相关的大量空间异质性，理解和控制其在纳米级的复杂竞争相互作用仍然是一个挑战。 Here, we present an all-round dynamic control of intra- and inter-layer excitonic processes in a WSe$_2$/Mo$_{0.5}$W$_{0.5}$Se$_2$ heterobilayer using multifunctional tip-enhanced photoluminescence (TEPL) spectroscopy.具体而言，我们以<20 nm的空间分辨率以可逆的方式控制辐射重组路径和发射速率，电子带隙能，并以<20 nm的空间分辨率进行中性。通过同时进行光谱TEPL测量值，分别通过尖端尖端 - 直钉距离和层间距离，GPA尺度局部压力和等离子热电子注射的尖端引起的工程来实现。这种独特的纳米机电机械控制方法为开发基于TMD Heterobilayers的多功能纳米异常设备提供了新的策略。
Emerging photo-induced excitonic processes in transition metal dichalcogenide (TMD) heterobilayers, e.g., coupling, dephasing, and energy transfer of intra- and inter-layer excitons, allow new opportunities for ultrathin photonic devices. Yet, with the associated large degree of spatial heterogeneity, understanding and controlling their complex competing interactions at the nanoscale remains a challenge. Here, we present an all-round dynamic control of intra- and inter-layer excitonic processes in a WSe$_2$/Mo$_{0.5}$W$_{0.5}$Se$_2$ heterobilayer using multifunctional tip-enhanced photoluminescence (TEPL) spectroscopy. Specifically, we control the radiative recombination path and emission rate, electronic bandgap energy, and neutral to charged exciton conversion with <20 nm spatial resolution in a reversible manner. It is achieved through the tip-induced engineering of Au tip-heterobilayer distance and interlayer distance, GPa scale local pressure, and plasmonic hot-electron injection respectively, with simultaneous spectroscopic TEPL measurements. This unique nano-opto-electro-mechanical control approach provides new strategies for developing versatile nano-excitonic devices based on TMD heterobilayers.
