2018/06/09 by Mohamed Herira, Herira, Mohamed, Hela Boustanji +3
Engineering · Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Strong Light-Matter Interactions #Thermal Radiation and Cooling Technologies
paper · pdf · doi:10.48550/arxiv.1806.03450
openalex publication_date 2018/06/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present a theoretical model that allows us to describe the dynamics of\nexciton polaritons in the strong-coupling regime in a monolayer WS2 based\nsemiconductor microcavity. Numerical simulations using Boltzmann equations give\nan overall description of polariton kinetics over a temperature range of\n130-230K, under nonresonant excitation. Here, only the scattering rate via\noptical phonons (LO) from the upper (UP) towards lower (LP) polariton branches\nis considered. According this model we show the importance of the radiative\nlifetime of the polaritonic states relative to polariton relaxation rate. Our\nresults show as the cavity detuning changes from negative (130 K) to positive\n(230 K) values, the UP branch can be tuned from a more excitonlike to a more\nphotonlike state at small wave vector k. We deduce that the UP states have a\nfaster lifetime and the polariton relaxation time into the LP energy states\nbecomes very efficient. Thus, the UP occupation starts to decrease, and we\nobserve a simultaneous increase in the occupation of the LP branch.\nFurthermore, the polariton states are less occupied for small excitation pump\nrate, the calculated behavior is linear. In the high pumping regime, we observe\nthe nonlinear behavior of cavity polaritons and occupation factors much larger\nthan unity are reached.\n