2020/11/30 by Dmitry K. Efimkin, Emma K. Laird, Emma Laird +4
Materials Science · Physics and Astronomy · #2D Materials and Applications #Absorption (acoustics) #Biexciton #Charge (physics) #Charge carrier #Condensed matter physics #Dipole #Doping #Electron #Excited state #Exciton #Physics #Polaron #Quantum and electron transport phenomena #Quantum mechanics #Semiconductor #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.103.075417
published as Phys. Rev. B 103, 075417 (2021) · 16 pages, and 10 figures. Published version
openalex publication_date 2021/02/10 · arxiv created 2021/02/14 · arxiv updated 2021/02/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Recently, it has been demonstrated that the absorption of moderately doped two-dimensional semiconductors can be described in terms of exciton polarons. In this scenario, attractive and repulsive polaron branches are formed due to interactions between a photoexcited exciton and a Fermi sea of excess charge carriers. These interactions have previously been treated in a phenomenological manner. Here, we present a microscopic derivation of the electron-exciton interactions which utilizes a mixture of variational and perturbative approaches. We find that the interactions feature classical charge-dipole behavior in the long-range limit, and that they are only weakly modified for moderate doping. We apply our theory to the absorption properties and show that the dependence on doping is well captured by a model with a phenomenological contact potential.