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DTSTART;TZID=Europe/Paris:20221129T140000
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DTSTAMP:20260423T180143
CREATED:20221128T073427Z
LAST-MODIFIED:20221128T073427Z
UID:8690-1669730400-1669735800@fermi.univ-tlse3.fr
SUMMARY:Trions and Fermi-polarons in 2D semiconductors (Mikhail Glazov / Seminar / LPT). - 29/11/2022\, 14H
DESCRIPTION:Mikhail Glazov\, Institut Ioffe\, Saint-Pétersbourg \nSummary : \n \n\nRecently emerged two-dimensional semiconductors based on transition metal dichalcogenides demonstrate spectacular properties and are considered as materials beyond graphene for optoelectronics\, spintronics\, valleytronics\, and straintronics. \nOptical response of these atom-thin semiconductors is dominated by the excitons — Coulomb bound electron hole pairs. Strong Coulomb interaction makes it also possible to observe charged excitons also known as trions : three particle complexes consisting of an electron and two holes or a hole and two electrons. These complexes are formed in the presence of resident holes or electrons in the sample. \nIn my talk\, after a brief introduction into the physics of two-dimensional semiconductors\, I will discuss theoretical approaches to describe the optical and transport properties of excitons interacting with the Fermi-sea of resident electrons. Two complementary approaches are presented : (i) the trion one based on the consideration of a free particle bound state and (ii) the Fermi-polaron one where an exciton is considered as a mobile impurity in the Fermi-sea. We demonstrate that in many relevant situations these approaches yield similar results. We also present the situations where both models contradict each other\, enabling experimental distinction between the trion and Fermi-polaron approaches. \nWe focus on description of optical absorption and emission effects\, fine structure of the energy spectrum and diffusion of the Coulomb-correlated complexes. Theoretical results will be illustrated by the experimental data.
URL:https://fermi.univ-tlse3.fr/event/trions-and-fermi-polarons-in-2d-semiconductors-mikhail-glazov-seminar-lpt-29-11-2022-14h/
LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France
CATEGORIES:Events,LPT,Seminars
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