Phonon-exciton Interactions in WSe2 under a quantizing magnetic field

摘要

Schematic of the h-BN encapsulated monolayer WSe device. Optical microscope image of the device. The flakes of few-layer h-BN, few-layer graphene, and monolayer WSe are outlined with different colors. The scale bar is 20 µm. , PL spectra of the monolayer WSe as a function of top gate voltage for the σ σ configuration (σ excitation and σ detection) and the σ σ configuration (σ excitation and σ detection), respectively, with a CW laser excitation centered at 1.879 eV and an excitation power of 50 µW. The color represents the PL intensity. Besides the bright exciton (X ), dark exciton (X ), positive trion (X ), intervalley trion , intravalley trion , and the recently discovered positive dark trion , negative dark trion , intervalley exciton–phonon replica ( ), and dark exciton–phonon replica , there are additional emerging excitonic states that are labeled as , , , , , , , and in the electron- and hole-doping regions. In addition, emerges in the σ σ configuration.