Electrically Tunable Single Polaritonic Quantum Dot at Room Temperature

REVIEWS AND HIGHLIGHTS	QUANTUM SCIENCE	MOLECULAR AND SOFT-MATTER	ULTRAFAST NANO-OPTICS AND NANOPHOTONICS	MINERALOGY AND GEOCHEMISTRY

Hyeongwoo Lee, Benjamin G. Whetten, Byong Jae Kim, Ju Young Woo, Yeonjeong Koo, Jinhyuk Bae, Mingu Kang, Taeyoung Moon, Huitae Joo, Sohee Jeong, Jaehoon Lim, Alexander L. Efros, Markus B. Raschke, Matthew Pelton, and Kyoung-Duck Park
Phys. Rev. Lett. 132, 133001 (2024).
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Exciton-polaritons confined in plasmonic cavities are hybridized light-matter quasiparticles, with distinct optical characteristics compared to plasmons and excitons alone. Here, we demonstrate the electric tunability of a single polaritonic quantum dot operating at room temperature in electric-field tip-enhanced strong coupling spectroscopy. For a single quantum dot in the nanoplasmonic tip cavity with variable dc local electric field, we dynamically control the Rabi frequency with the corresponding polariton emission, crossing weak to strong coupling. We model the observed behaviors based on the quantum confined Stark effect in the strong coupling regime.