Nanoscale Manipulation of Exciton–Trion Interconversion in a MoSe<sub>2</sub> Monolayer via Tip-Enhanced Cavity-Spectroscopy
Mingu Kang, Su Jin Kim, Huitae Joo, Yeonjeong Koo, Hyeongwoo Lee, Hyeongwoo Lee, Hyun Seok Lee, Hyun Seok Lee, Yung Doug Suh, Kyoung‐Duck Park
Abstract
Emerging light–matter interactions in metal–semiconductor hybrid platforms have attracted considerable attention due to their potential applications in optoelectronic devices. Here, we demonstrate plasmon-induced near-field manipulation of trionic responses in a MoSe 2 monolayer using tip-enhanced cavity-spectroscopy (TECS). The surface plasmon–polariton mode on the Au nanowire can locally manipulate the exciton (X 0 ) and trion (X-) populations of MoSe 2 . Furthermore, we reveal that surface charges significantly influence the emission and interconversion processes of X 0 and X-. In the TECS configuration, the localized plasmon significantly affects the distributions of X 0 and X- due to the modified radiative decay rate. Additionally, within the TECS cavity, the electric doping effect and hot electron generation enable dynamic interconversion between X 0 and X- at the nanoscale. This work advances our understanding of plasmon–exciton–hot electron interactions in metal–semiconductor–metal hybrid structures, providing a foundation for an optimal trion-based nano-optoelectronic platform.