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GET /api/v1/mementos/204/events/?format=api&ordering=slug
{ "count": 2, "next": null, "previous": null, "results": [ { "id": 71509, "title": "SPIN DEFECTS IN HEXAGONAL BORON NITRIDE FOR SENSING APPLICATIONS", "slug": "spin-defects-in-hexagonal-boron-nitride-for-sensin", "event_url": "https://memento.epfl.ch/event/spin-defects-in-hexagonal-boron-nitride-for-sensin", "visual_url": "https://memento.epfl.ch/image/32847/200x112.jpg", "visual_large_url": "https://memento.epfl.ch/image/32847/720x405.jpg", "visual_maxsize_url": "https://memento.epfl.ch/image/32847/max-size.jpg", "lang": "en", "start_date": "2026-04-07", "end_date": "2026-04-07", "start_time": "14:00:00", "end_time": "15:00:00", "description": "<p>2D materials have emerged over the last decade as the new playground for quantum photonics<br>\r\ndevices. Among them, hexagonal boron nitride (hBN) is an interesting candidate, mainly because of its<br>\r\ncrystallographic compatibility with different 2D materials, but also because of its ability to harbour optically<br>\r\nactive defects that generate single photons. The negatively charged boron vacancy was the first intrinsic<br>\r\noptically addressable spin defect in hBN reported in 2020, allowing coherent control at room temperature.<br>\r\nAlthough other types of spin centres have been found in this material since then, this spin-1 colour centre<br>\r\nremains the only one with a clearly elucidated structure. Practical applications of hBN spin centres as<br>\r\nintrinsic magnetic field, temperature, pressure, etc. sensors in van der Waals heterostructures are hence<br>\r\nenvisioned. To further boost the quantum sensing applications of this spin defect in hBN, we are currently<br>\r\ninvestigating the dynamics of the intermediate state, also known as the metastable state, because it is likely<br>\r\nto trap electrons for a certain time, which affects the subsequent sensing protocol when the pulsed<br>\r\nmagnetic resonance experiment is designed.</p>", "image_description": "Prof. Vladimir Dyakonov", "creation_date": "2026-04-01T09:02:57", "last_modification_date": "2026-04-01T10:43:24", "link_label": "", "link_url": "", "canceled": "False", "cancel_reason": "", "place_and_room": "BM 5202", "url_place_and_room": "https://plan.epfl.ch/?room==BM%205202", "url_online_room": "", "spoken_languages": [ "https://memento.epfl.ch/api/v1/spoken_languages/2/?format=api" ], "speaker": "<strong>Prof. Vladimir Dyakonov</strong> holds the Chair of Experimental Physics on the Faculty of Physics and Astronomy of Julius-Maximilian University of Würzburg, Germany since 2004. He studied physics at the University of Leningrad and received his diploma degree in 1986. Since 1990, he has been a visiting researcher at the universities of Bayreuth (Germany), Antwerp (Belgium) and Linz (Austria). He finished his habilitation in experimental physics at the University of Oldenburg (Germany) in 2001. In 2007-2009 he was the Vice-dean and in 2013-2015 the Dean of the Faculty of Physics and Astronomy at the University of Würzburg. Dyakonov’s main research interests are in the fields of semiconductor spectroscopy, thin-film organic and hybrid photovoltaics, organic light-emitting diodes and sensors. He published ca. 230 peer-reviewed scientific papers and has h-index of 84. ", "organizer": "<a href=\"https://people.epfl.ch/aleksandra.radenovic\">Prof. Aleksandra Radenovic</a>", "contact": "<a href=\"mailto:[email protected]\">Martine Truan</a> ", "is_internal": "False", "theme": "", "vulgarization": { "id": 2, "fr_label": "Public averti", "en_label": "Informed public" }, "registration": { "id": 3, "fr_label": "Entrée libre", "en_label": "Free" }, "keywords": "hBn - quantum photonics - 2D materials", "file": null, "icalendar_url": "https://memento.epfl.ch/event/export/120254/", "category": { "id": 1, "code": "CONF", "fr_label": "Conférences - Séminaires", "en_label": "Conferences - Seminars", "activated": true }, "academic_calendar_category": null, "domains": [], "mementos": [ "https://memento.epfl.ch/api/v1/mementos/8/?format=api", "https://memento.epfl.ch/api/v1/mementos/5/?format=api", "https://memento.epfl.ch/api/v1/mementos/111/?format=api", "https://memento.epfl.ch/api/v1/mementos/389/?format=api", "https://memento.epfl.ch/api/v1/mementos/204/?format=api", "https://memento.epfl.ch/api/v1/mementos/14/?format=api", "https://memento.epfl.ch/api/v1/mementos/191/?format=api" ] }, { "id": 71338, "title": "Probing Ultrafast Electron Motion with Attosecond X-ray Free Electron Lasers", "slug": "probing-ultrafast-electron-motion-with-attosecond", "event_url": "https://memento.epfl.ch/event/probing-ultrafast-electron-motion-with-attosecond", "visual_url": "https://memento.epfl.ch/image/32692/200x112.jpg", "visual_large_url": "https://memento.epfl.ch/image/32692/720x405.jpg", "visual_maxsize_url": "https://memento.epfl.ch/image/32692/max-size.jpg", "lang": "en", "start_date": "2026-04-23", "end_date": "2026-04-23", "start_time": "17:15:00", "end_time": "18:30:00", "description": "<p>The ultrafast motion of electrons is a frontier problem for photochemical processes, as electron motion is a key ingredient of all chemical reactions. Electronic rearrangement is also the means by which light energy is harnessed in photochemistry. The timescale for coherent electron dynamics is set by the energetic splitting of the electronic states, which in small molecular systems, is on the scale of an electron volt (eV). This sets the natural timescale for electronic motion to be few-to-sub femtosecond (fs).<br>\r\n<br>\r\nTo approach these extreme timescales, we can use short pulses of light to excite small quantum systems. For instance, the impulsive interactions between a light field and a quantum system can induce time-dependent oscillations in the charge density. Such electronic wavepacket motion (in the absence of nuclear motion) has come to be referred to as charge migration [1]. While the initial charge dynamics following impulsive excitation (or ionization) begins as purely electronic motion, this wavepacket will couple to other degrees of freedom in the system (i.e. nuclear motion or chemical dynamics) and lead to localization of the charge. The transfer of electronic charge across molecular bonds is fundamental to an understanding of charge transfer phenomena.<br>\r\n<br>\r\nThe study of these fundamental phenomena requires state-of-the-art light sources, such as the Linac Coherent Light Source (LCLS), an X-ray free electron laser (XFEL) facility which produces high-brightness, ultrashort pulses, with wavelength continuously tunable across the x-ray regime. Schemes to provide isolated, sub-femtosecond pulses from an FEL are being explored at facilities world-wide, and recently we have demonstrated such pulses at the LCLS [2]; opening the door for time-resolved measurements of ultrafast electron dynamics on their natural timescale. In my talk, I will highlight our recent developments in probing electronic motion in small molecular systems. We have employed sub-femtosecond pulses from the XFEL to study ultrafast charge dynamics in both core-excited [3,4,5] and low-lying cationic systems [6]. We are also developing nonlinear x-ray spectroscopies [7,8] to initiate and control electron dynamics. The control of coherent electron motion represents a significant step towards achieving charge-directed reactivity [9], a grand challenge for the field of attosecond science.<br>\r\n<br>\r\n[1] Cederbaum and Zobeley 1999 Chemical Physics Letters 307 205–210<br>\r\n[2] Duris and Li et al. 2020 Nature Photonics 14 30-36<br>\r\n[3] Li and Driver et al. 2022 Science 375 285-290<br>\r\n[4] Driver et al. 2024 Nature 632 762-767 (2024)<br>\r\n[5] Wang and Driver et al. Phys. Rev. X 15 011008 (2005)<br>\r\n[6] Driver et al. ArXiv:2411.01700<br>\r\n[7] O’Neal et al. 2020 Phys. Rev. Lett. 125 073203<br>\r\n[8] Biggs et al. 2023 Proc. Nat. Acad. Sci. 110 15597-15601<br>\r\n[9] F. Remacle, R. D. Levine, and M. A. Ratner 1998 Chem. Phys. Lett. 285, 25<br>\r\n </p>", "image_description": "", "creation_date": "2026-03-10T09:08:13", "last_modification_date": "2026-03-10T09:08:45", "link_label": "", "link_url": "", "canceled": "False", "cancel_reason": "", "place_and_room": "CH G1 495", "url_place_and_room": "https://plan.epfl.ch/?room==CH%20G1%20495", "url_online_room": "https://epfl.zoom.us/j/67570484652?pwd=UpB6UFTCS3n1QpxlIaYM2UvuMD3tkr.1", "spoken_languages": [ "https://memento.epfl.ch/api/v1/spoken_languages/2/?format=api" ], "speaker": "James Cryan, Stanford Univ. / SLAC", "organizer": "Christoph Bostedt", "contact": "Christoph Bostedt", "is_internal": "False", "theme": "", "vulgarization": { "id": 2, "fr_label": "Public averti", "en_label": "Informed public" }, "registration": { "id": 3, "fr_label": "Entrée libre", "en_label": "Free" }, "keywords": "pcseminar", "file": null, "icalendar_url": "https://memento.epfl.ch/event/export/120028/", "category": { "id": 1, "code": "CONF", "fr_label": "Conférences - Séminaires", "en_label": "Conferences - Seminars", "activated": true }, "academic_calendar_category": null, "domains": [], "mementos": [ "https://memento.epfl.ch/api/v1/mementos/1/?format=api", "https://memento.epfl.ch/api/v1/mementos/5/?format=api", "https://memento.epfl.ch/api/v1/mementos/204/?format=api", "https://memento.epfl.ch/api/v1/mementos/14/?format=api", "https://memento.epfl.ch/api/v1/mementos/191/?format=api", "https://memento.epfl.ch/api/v1/mementos/6/?format=api" ] } ] }
