Drift-dominant exciton funneling and trion conversion in 2D semiconductors on the nanogap.

ABSTRACT: Understanding and controlling the nanoscale transport of excitonic quasiparticles in atomically thin two-dimensional (2D) semiconductors are crucial to produce highly efficient nano-excitonic devices. Here, we present a nanogap device to selectively confine excitons or trions of 2D transition metal dichalcogenides at the nanoscale, facilitated by the drift-dominant exciton funneling into the strain-induced local spot. We investigate the spatiospectral characteristics of the funneled excitons in a WSe₂ monolayer (ML) and converted trions in a MoS₂ ML using hyperspectral tip-enhanced photoluminescence imaging with <15-nm spatial resolution. In addition, we dynamically control the exciton funneling and trion conversion rate by the gigapascal-scale tip pressure engineerin

SUBMITTER: Lee H 

PROVIDER: S-EPMC8816338 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature