Room-Temperature Quantum-Confined Stark Effect in Atomically Thin Semiconductor

TL;DR

This study demonstrates the room-temperature quantum-confined Stark effect in a monolayer MoSe2, showing electric field-induced spectral shifts and exciton lifetime changes, advancing 2D semiconductor optoelectronic applications.

Contribution

First experimental observation of the room-temperature quantum-confined Stark effect in a 2D semiconductor monolayer using photoluminescence spectroscopy.

Findings

Electric field causes spectral shifts and linewidth broadening.

Exciton non-radiative lifetime shortens under electric field.

Results have implications for nanoscale metrology and optoelectronic devices.

Abstract

Electric field-controlled, two-dimensional (2D) exciton dynamics in transition metal dichalcogenide monolayers is a current research focus in condensed matter physics. We have experimentally investigated the spectral and temporal properties of the A-exciton in a molybdenum diselenide (MoSe2) monolayer under controlled variation of a vertical, electric dc field at room temperature. By using steady-state and time-resolved photoluminescence spectroscopies, we have observed dc field-induced spectral shifts and linewidth broadenings that are consistent with the shortening of the exciton's non-radiative lifetime due to field-induced dissociation. We discuss the implications of the results for future developments in nanoscale metrology and exploratory, optoelectronics technologies based on layered, 2D semiconductors.