Tailoring Exciton Dynamics in TMDC Heterobilayers in the Quantum
Plasmonic Regime
- URL: http://arxiv.org/abs/2306.06337v1
- Date: Sat, 10 Jun 2023 03:19:42 GMT
- Title: Tailoring Exciton Dynamics in TMDC Heterobilayers in the Quantum
Plasmonic Regime
- Authors: Mahfujur Rahaman, Gwangwoo Kim, Kyung Yeol Ma, Seunguk Song, Hyeon Suk
Shin, and Deep Jariwala
- Abstract summary: Control of excitons in transition metal dichalcogenides (TMDCs) is interesting for tailoring light-matter interactions.
We investigated excitons dynamics in TMDC heterobilayers via locally controlled junction current.
Our results show that tip-induced radiative relaxation of intralayer (interlayer) excitons becomes dominant in the quantum tunneling regime.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Control of excitons in transition metal dichalcogenides (TMDCs) and their
heterostructures is fundamentally interesting for tailoring light-matter
interactions and exploring their potential applications in high-efficiency
optoelectronic and nonlinear photonic devices. While both intra- and interlayer
excitons in TMDCs have been heavily studied, their behavior in the quantum
tunneling regime, in which the TMDC or its heterostructure is optically excited
and concurrently serves as a tunnel junction barrier, remains unexplored. Here,
using the degree of freedom of a metallic probe in an atomic force microscope,
we investigated both intralayer and interlayer excitons dynamics in TMDC
heterobilayers via locally controlled junction current in a finely tuned
sub-nanometer tip-sample cavity. Our tip-enhanced photoluminescence
measurements reveal a significantly different exciton-quantum plasmon coupling
for intralayer and interlayer excitons due to different orientation of the
dipoles of the respective e-h pairs. Using a steady-state rate equation fit, we
extracted field gradients, radiative and nonradiative relaxation rates for
excitons in the quantum tunneling regime with and without junction current. Our
results show that tip-induced radiative (nonradiative) relaxation of intralayer
(interlayer) excitons becomes dominant in the quantum tunneling regime due to
the Purcell effect. These findings have important implications for near-field
probing of excitonic materials in the strong-coupling regime.
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