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DTSTART;TZID=Europe/Paris:20220712T140000
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DTSTAMP:20260423T190649
CREATED:20220706T043129Z
LAST-MODIFIED:20220707T072752Z
UID:8142-1657634400-1657641600@fermi.univ-tlse3.fr
SUMMARY:Hexcitons and oxcitons in monolayer WSe2. - (Hanan Dery / LPCNO / Seminar). - 12/07/2022
DESCRIPTION:Hanan Dery (University of Rochester) \nAbstract: \nHydrogen-like bound states of photoexcited electron-hole pairs in semiconductors — that is\, excitons — have been a focus of considerable study for more than half a century. In undoped direct-gap semiconductors\, neutral excitons comprise the photogenerated electron and hole in the conduction and valence bands (CB and VB)\, respectively\, and typically manifest as discrete optical resonances below the free-particle band-gap energy. More interesting states arise when electron-hole (e-h) pairs are photoexcited into doped semiconductors containing a Fermi-sea of mobile carriers. \nIn the archetypal monolayer semiconductor WSe2\, the distinct ordering of spin-polarized valleys (low-energy pockets) in the CB allows for studies of not only simple neutral excitons and charged excitons (i.e.\, trions)\, but also more complex many-body states that are predicted at higher electron densities [1]. I will discuss magneto-optical measurements of electron-rich WSe2 monolayers [2]\, and interpret the spectral lines that emerge at high electron doping as optical transitions of 6-body exciton states (« hexcitons ») and 8-body exciton states (« oxcitons »). These many-body states emerge when a photoexcited electron-hole pair interacts simultaneously with multiple Fermi seas\, each having distinguishable spin and valley quantum numbers. \n\nD. Van Tuan and H. Dery\, Composite excitonic states in doped semiconductors\, arXiv:2202.08374.\nD. Van Tuan\, S.-F. Shi\, X. Xu\, S. A. Crooker and H. Dery\, Hexcitons and oxcitons in monolayer WSe2\, arXiv:2202.08375.\n\n 
URL:https://fermi.univ-tlse3.fr/event/hexcitons-and-oxcitons-in-monolayer-wse2-hanan-dery-lpcno-seminar-12-07-2022/
LOCATION:Amphi Vinci\, bâtiment 20 du LPCNO\, INSA – LPCNO : 135 avenue de Rangueil\, Toulouse\, 31077\, France
CATEGORIES:Events,LPCNO,Seminars
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