2018/03/23 by Christian Gebhardt, Michael Förg, Gebhardt, Christian +19 · 1 citation
Engineering · Physics and Astronomy · #FOS: Physical sciences #Mechanical and Optical Resonators #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Optics (physics.optics) #Strong Light-Matter Interactions #Thermal Radiation and Cooling Technologies
paper · pdf · doi:10.48550/arxiv.1803.08690
openalex publication_date 2018/03/23 · openalex created_date 2022/10/04 · openalex updated_date 2026/07/28
Atomically thin crystals of transition metal dichalcogenides (TMDs) host\nexcitons with strong binding energies and sizable light-matter interactions.\nCoupled to optical cavities, monolayer TMDs routinely reach the regime of\nstrong light-matter coupling, where excitons and photons admix coherently to\nform quasiparticles known as polaritons up to room temperature. Here, we\nexplore the two-dimensional nature of TMD polaritons with cavity-assisted\nhyperspectral imaging. Using extended WS2 monolayers, we establish the\nregime of strong coupling with a scanning microcavity to map out polariton\nproperties and correlate their spatial features with intrinsic and extrinsic\neffects. We find a high level of homogeneity, and show that polariton splitting\nvariations are correlated with intrinsic exciton properties such as oscillator\nstrength and linewidth. Moreover, we observe a deviation from thermal\nequilibrium in the resonant polariton population, which we ascribe to\nnon-perturbative polariton-phonon coupling. Our measurements reveal a\npromisingly consistent polariton landscape, and highlight the importance of\nphonons for future polaritonic devices.\n