Observation of hybrid Tamm-plasmon exciton- polaritons with GaAs quantum wells and a MoSe2 monolayer

Abstract

Strong light matter coupling between excitons and microcavity photons, as described in the framework of cavity quantum electrodynamics, leads to the hybridization of light and matter excitations. The regime of collective strong coupling arises, when various excitations from different host media are strongly coupled to the same optical resonance. This leads to a well-controllable admixture of various matter components in three hybrid polariton modes. Here, we study a cavity device with four embedded GaAs quantum wells hosting excitons that are spectrally matched to the A-valley exciton resonance of a MoSe2 monolayer. The formation of hybrid polariton modes is evidenced in momentum resolved photoluminescence and reflectivity studies. We describe the energy and k-vector distribution of exciton-polaritons along the hybrid modes by a thermodynamic model, which yields a very good agreement with the experiment.

Large Rabi splitting obtained in Ag-WS2 strong-coupling heterostructure with optical microcavity at room temperature

“…In the past decades, many attentions have been paid to plasmon-TMD-exciton systems for studying light-matter interactions, such as plasmon-induced resonance energy transfer 29,30 , tunable photoluminance by plasmon [31][32][33][34][35][36][37] and Fano resonance [38][39][40] . The strong plasmon-TMD-exciton coupling also has been investigated [41][42][43][44][45][46][47][48] . However, due to the intrinsic loss of the metal, the quality factor and cooperativity of plasmonic nanocavities are lower than those of conventional optical cavities, and therefore the reliable plasmon-exciton strong coupling has seldom been reported at room temperature.…”

Revealing Strong Plasmon-Exciton Coupling between Nanogap Resonators and Two-Dimensional Semiconductors at Ambient Conditions

“…Traditional photonic resonators, such as Fabry-Perot (FP) [11,12] and photonic crystal cavities [13], though having low damping loss, are incapable of compressing mode volumes below the diffraction limit, which restrains the further enhancement of coupling strength. In this context, plasmonic resonators, noble metal nanoparticles allowing the excitation of surface plasmons, can highly confine incident photons into subwavelength volumes, providing ultracompact and robust platforms for the realization of strong coupling at room temperature [14][15][16][17][18]. Recent studies have successfully demosntrated the strong plasmon-exciton coupling in 2D TMDC semiconductors at the single nanoparticle level [19,20], exhibiting great advantages of plasmonic resonators in enhancing coupling strength as compared to traditional cavity systems.…”

Recent Progress on Exciton Polaritons in Layered Transition‐Metal Dichalcogenides

“…The polariton dispersion relation in the Tamm structure was measured by angle‐resolved PL spectra and a Rabi splitting of 23.5 meV is resolved (Figure h). In a different study, hybrid Tamm‐plasmon EPs generated due to the strong coupling between excitons in GaAs quantum wells, MoSe 2 monolayer, and cavity photons were observed. Such hybrid PEPs inherit the properties of strongly interacting excitons from both GaAs quantum wells and MoSe 2 , resulting in Bose‐Einstein condensation at an elevated temperature of 4.2 K …”