Dynamics and Decoherence of Exciton Polaron in Monolayer Transition Metal Dichalcogenides
| Autor: | R.M. Keumo Tsiaze, A. Kitio Teguimfouet, C. Kenfack-Sadem, A. Kenfack-Jiotsa |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Physics Photon Quantum decoherence Condensed matter physics Exciton 02 engineering and technology Photon energy Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Condensed Matter Physics Polaron 01 natural sciences Electronic Optical and Magnetic Materials Variational method Quantum dot 0103 physical sciences Materials Chemistry Absorption (logic) Electrical and Electronic Engineering 0210 nano-technology |
| Zdroj: | Journal of Electronic Materials. 50:2911-2921 |
| ISSN: | 1543-186X 0361-5235 |
| DOI: | 10.1007/s11664-021-08808-9 |
| Popis: | The dynamics and decoherence of excitonic polaron in a two-dimensional monolayer transition metal dichalcogenides (TMDCs) in quantum dot have been investigated using a variational method. We focused on confinement and temperature effects on dynamics properties and decoherence of exciton polaron, and found that the entropy increases with increasing temperature and dot radius. We observed that due to temperature the lifetime decreases and exciton or polaron can exits independently in the system. The high mobility of exciton-polaron decreases when enhancing the temperature and dot radius. We show that the optical absorption of photon starts when the photon energy is twice the phonon energy. Among the TMDCs studied, we observed the lowest entropy for $${\text{WS}}_{2}$$ , the longest lifetime for $${\text{MoSe}}_{2}$$ , the highest mobility for $${\text{MoS}}_{2}$$ and the greatest absorption for $${\text{MoS}}_{2}$$ . We have also determined the ranges of decoherence for each property, and it appears that the increase in temperature, dot radius and photon energy does not favor decoherence. It is seen that, in the decoherence phase, the system has lower disorder, higher amplitude of lifetime, mobility and absorption. |
| Databáze: | OpenAIRE |
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