Exciton-phonon relaxation bottleneck and radiative decay of thermal exciton reservoir in two-dimensional materials

被引：24
作者：
Slobodeniuk, A. O. [1 ]
Basko, D. M. [2 ,3 ]
机构：
[1] CNRS UJF UPS INSA, Lab Natl Champs Magnet Intenses, 25 Rue Martyrs,BP 166, F-38042 Grenoble, France
[2] Univ Grenoble Alpes, Lab Phys & Modelisat Milieux Condenses, 25 Rue Martyrs, F-38042 Grenoble, France
[3] CNRS, 25 Rue Martyrs, F-38042 Grenoble, France
来源：
PHYSICAL REVIEW B | 2016年 / 94卷 / 20期
关键词：
MONOLAYER; DYNAMICS; LINEWIDTH; LIFETIMES; WSE2; DEPENDENCE; ENERGY; LAYER; MOS2;
D O I：
10.1103/PhysRevB.94.205423
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We study exciton radiative decay in a two-dimensional material, taking into account large thermal population in the nonradiative states, from which excitons are scattered into the radiative states by acoustic phonons. We find an analytical solution of the kinetic equation for the nonequilibrium distribution function of excitons in the radiative states. Our estimates for bright excitons in transition-metal dichalcogenides indicate a strong depletion of radiative state population due to insufficient exciton-phonon scattering rate at low temperatures.
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页数：8
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