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DTSTART;TZID=Europe/Paris:20231214T150000
DTEND;TZID=Europe/Paris:20231214T163000
DTSTAMP:20260422T185422
CREATED:20231209T080611Z
LAST-MODIFIED:20231211T083012Z
UID:9508-1702566000-1702571400@fermi.univ-tlse3.fr
SUMMARY:L’esprit scientifique et l’appareil psychique. - (Marc Thiberge /  Seminar / CEMES). - 14/12/2023\, 15H
DESCRIPTION:Les séminaires du jeudi\n \nMarc Thiberge\,   Médecin\, Psychiatre\, Psychanalyste\, Membre de l’ex École freudienne de Paris\, cofondateur de l’Invention Freudienne et de l’Association A.L.T.E.R.S \nRésumé :\nCe que les sciences visent\, n’est-ce pas depuis l’épistémé des grecs jusqu’aux sciences modernes\, d’échapper à toute subjectivité et de décentrer notre point de vue?\nMais si c’est la dimension subjective du sujet qui fait humanité\, comment poser la question du sujet de façon matérialiste?\nNous sommes devenus aux dires d’un auteur comme Bruno Latour\, des enfants de GAIA.\nComment juguler les incendies qui font de plus en plus de l’humanité moderne\, un collectif d’incendiaires qui pourrait faire regretter à Prométhée son don du feu?
URL:https://fermi.univ-tlse3.fr/event/lesprit-scientifique-et-lappareil-psychique-marc-thiberge-seminar-cemes-14-12-2023-15h/
LOCATION:salle de conférence du CEMES\, CEMES - 29\, rue Jeanne Marvig BP 94347\, Toulouse\, 31055\, France
CATEGORIES:CEMES,Events,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20231214T150000
DTEND;TZID=Europe/Paris:20231214T170000
DTSTAMP:20260422T185422
CREATED:20231209T063906Z
LAST-MODIFIED:20231211T083020Z
UID:9430-1702566000-1702573200@fermi.univ-tlse3.fr
SUMMARY:Tuning the optoelectronic properties of TMD monolayers with dielectric environment\, photochemical processes\, and strain. - (George Kioseoglou / LPCNO / Seminar). - 14/12/2023\, 15H
DESCRIPTION:George Kioseoglou\, University of Crete\, Greece \nSéminaire LPCNO\, seminar room\, INSA\, Build. 27\, Room 2.20 (2nd floor left) \nSummary :\nMonolayers of MX2-type (M=Mo or W and X=S or Se) Transition Metal Dichalcogenides (TMDs)\,\nexhibit promising potential for future 2D nanoelectronics owing to their unique optoelectronic properties.\nIn this seminar\, I will present methods for controlling their optical and electronic characteristics through\nthe engineering of their dielectric environment\, employing photochemical methods\, and applying\nmechanical strain.\nIn particular\, we investigate WS2 monolayers on pre-patterned Si/SiO2 substrates with cylindrical\nwells of 3 μm in diameter\, analyzing strained and suspended areas. Raman mapping experiments quantify\nstrain\, revealing a 10-fold enhanced photoluminescence efficiency with strong neutral excitonic emission\nin suspended areas. TMD optoelectronic properties are chemically controlled by modulating the Fermi level\nusing UV-assisted photochlorination processes in WS2 [1\,2] and WSe2 [3] monolayers. Systematic shifts\nand relative intensities between neutral and charged excitons indicate a controllable decrease in electron\ndensity\, switching WSe2 from n-type to p-type semiconductor. Validation of chlorine species and DFT\ncalculations [4] predict p-type doping through chlorine adsorption on selenium vacancy sites. Investigating\nisotropic\, biaxial strain at room temperature on WS2 monolayers shows a strong shift on the order of ~130\nmeV per % of strain in neutral exciton emission and a decrease in circular polarization degree [5]. The\nanalysis reveals the interplay of energy and polarization relaxation channels\, as well as variations in the\nexciton oscillator strength affecting long-range exchange interactions. \n\n[1] I. Demeridou\, et al. 2D Mater. 6\, 015003 (2018)\n[2] I. Demeridou\, et al. Appl. Phys. Lett. 118\, 123103 (2021)\n[3] E. Katsipoulaki\, et al.\, 2D Mater. 10\, 045008 (2023)\n[4] G. Vailakis\, et al. Phys. Rev. Mater 7\, 024004 (2023)\n[5] G. Kourmoulakis\, et al.\, Appl. Phys. Lett. 123\, (2023) in print
URL:https://fermi.univ-tlse3.fr/event/tuning-the-optoelectronic-properties-of-tmd-monolayers-with-dielectric-environment-photochemical-processes-and-strain-george-kioseoglou-lpcno-seminar-14-12-2023-15h/
LOCATION:Salle 220\, LPCNO\, INSA – LPCNO : 135 avenue de Rangueil\, toulouse\, 31077\, France
CATEGORIES:Events,LPCNO,Seminars
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