A moirésuperlattice formed by stacking two lattice mismatched transition metal dichalcogenide monolayers, functions as a diffusion barrier that affects the energy transport and dynamics of interlayer excitons (electron and hole spatially concentrated in different monolayers). In this work, we experimentally quantify the diffusion barrier experienced by interlayer excitons in hexagonal boron nitrideencapsulated molybdenum diselenide/tungsten diselenide (MoSe 2 / WSe 2 ) heterostructures with different twist angles. We observe the localization of interlayer excitons at low temperature and the temperature-activated diffusivity as a function of twist angle and hence attribute it to the deep periodic potentials arising from the moirésuperlattice. We further support the observations with theoretical calculations, Monte Carlo simulations, and a three-level model that represents the exciton dynamics at various temperatures.

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The dielectric screening from the disordered media surrounding atomically thin transition metal dichalcogenides (TMDs) monolayers modifies the effective defect energy levels and thereby the transport and energy dynamics of excitons. In this work, we study this effect in WSe2 monolayers for different combinations of surrounding dielectric media. Specifically, we study the source of the anomalous diffusion of excitons in the WSe2 monolayer and attribute the anomaly to the modification of the energy distribution of defect states in different disordered dielectric environments. We use this insight to manipulate exciton transport by engineering the dielectric environment using a graphene/hexagonal boron nitride (h-BN) moiré superlattice. Finally, we observe that the effect of dielectric disorder is even more significant at high excitation fluences, contributing to the nonequilibrium phonon drag effect. These results provide an important step toward achieving control over the exciton energy transport for next-generation opto-excitonic devices.

We investigate the interaction of excitons in monolayer WSe 2 with the piezoelectric field of surface acoustic wave (SAW) at room temperature using photoluminescence (PL) spectroscopy and report a large in-plane exciton polarizability of 8.43 ± 0.18 × 10 −6 Dm/V. Such large polarizability arises due to the strong dielectric screening from the piezoelectric substrate. In addition, we show that the exciton-piezoelectric field interaction and population distribution between neutral excitons and trions can be optically manipulated by controlling the field screening using photogenerated free carriers. Finally, we model the broadening of the exciton PL line width and report that the interaction is dominated by type-II band edge modulation, because of the in-plane electric field in the system. The results help understand the interaction of excitons in monolayer transition-metal dichalcogenides that will aid in controlled manipulation of excitonic properties for applications in sensing, detection, and onchip communication.

With the development of new energy, three-phase grid connected converter has been widely applied. In order to meet the requirement of synchronous signals extraction under the condition of asymmetry, dc components and harmonic distortion, the positive and negative sequence components, amplitude and fundamental frequency of the voltage signal need to be extracted accurately. Based on dual second order generalized integrator frequency locked loop (DSOGI-FLL), the synchronization signal can be extracted under voltage asymmetry and distortion. But when the three-phase voltage is asymmetrical, dc components and multiple harmonics are influenced by the DSOGI-FLL method, the synchronous signal cannot be extracted accurately. In this paper, the structure of second order generalized integrator (SOGI)is improved, and the difference node and adaptive filter are added on the basis of SOGI, and the method of synchronous signal extraction based on improved dual self-turning second order generalized integrator frequency locked loop (DSSOGI-FLL) is proposed. This method can eliminate the effect of asymmetrical, dc components and multiple harmonics, and can extract the positive and negative sequence components, phase and frequency information accurately and quickly. The accuracy and effectiveness of the improved DSSOGI-FLL method are verified by simulation analysis.