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UID:MEC-a5cdd4aa0048b187f7182f1b9ce7a6a7@lpcno.insa-toulouse.fr
DTSTART:20220712T120000Z
DTEND:20220712T130000Z
DTSTAMP:20220916T120000Z
CREATED:20220916
LAST-MODIFIED:20230707
SUMMARY:Séminaire Hanan Dery
DESCRIPTION:Rochester University\nHexcitons and oxcitons in monolayer WSe2\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.In 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 chargedexcitons (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
X-ALT-DESC;FMTTYPE=text/html:<p>Rochester University</p>
<h4>Hexcitons and oxcitons in monolayer WSe2</h4>
<p>Hydrogen-like bound states of photoexcited electron-hole pairs in semiconductors &#8212; that is, excitons &#8212; 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.In 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 chargedexcitons (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 (&#8220;hexcitons&#8221;) and 8-body exciton states (&#8220;oxcitons&#8221;). 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</p>

URL:https://lpcno.insa-toulouse.fr/events/seminaire-hanan-dery/
ORGANIZER;CN=:MAILTO:
CATEGORIES:Séminaires
LOCATION:Bât. 27, Salle 2.20 (2ème étage gauche), INSA, 135 av. de Rangueil, Toulouse
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