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DTSTART;TZID=Europe/Paris:20260326T110000
DTEND;TZID=Europe/Paris:20260326T123000
DTSTAMP:20260409T230032
CREATED:20260325T081447Z
LAST-MODIFIED:20260325T084639Z
UID:12026-1774522800-1774528200@fermi.univ-tlse3.fr
SUMMARY:Quantum empty waves revisited. - (Thomas Durt / LCAR / Seminar). - 26/03/2026\, 11H
DESCRIPTION:Séminaire LCAR \nThomas Durt\,  Ecole Centrale Mediterranee\, Institut Fresnel\, Marseille \nSummary\nThe idea of empty waves can be traced back to Einstein who faced the following problem when he developed his theory of the photon: if the localized particle (the photon) carries all the energy and momentum\, how can the wave (here the Maxwell wave) be considered real? A possible way to answer this question is to consider the wave as an empty wave (what Einstein called Gespenterfelder -ghost field-)\, which corresponds to the so-called pilot-wave introduced by L. de Broglie in a quantum framework in 1926\, one century ago. \nIn our talk we will discuss these questions and present an experimental proposal aimed at putting into evidence the objective existence and the reality of such empty waves.
URL:https://fermi.univ-tlse3.fr/event/quantum-empty-waves-revisited-thomas-durt-lcar-seminar-26-03-2026-11h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LCAR,Seminars
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DTSTART;TZID=Europe/Paris:20260326T140000
DTEND;TZID=Europe/Paris:20260326T153000
DTSTAMP:20260409T230032
CREATED:20260325T073831Z
LAST-MODIFIED:20260325T084651Z
UID:12054-1774533600-1774539000@fermi.univ-tlse3.fr
SUMMARY:Terahertz Magnon-Polariton Control Using a Tunable Liquid Crystal Cavity. - (Dmitriy Yavorskiy /  LNCMI / Seminar). - 26/03/2026\, 14H
DESCRIPTION:Seminar LNCMI \nDmitriy Yavorskiy\, Polish Academy of Sciences in Warsaw \nSeminar LNCMI\, 26/03/2026\, 14H\, LNCMI\, Salle Pauthenet \nAbstract\nIn the strong light–matter coupling regime\, polariton modes emerge as hybrid excitations combining electromagnetic cavity modes and material resonances. While magnon–polaritons in ferromagnets have been extensively explored at microwave frequencies\, antiferromagnetic systems enable access to the terahertz (THz) range\, where strong coupling can be achieved using Fabry–Perot cavities. However\, antiferromagnetic magnons are typically tunable only via temperature or high magnetic fields\, which limits dynamic control of magnon–polariton states. Here we demonstrate remote electrical control of antiferromagnetic magnon–polaritons by combining an antiferromagnetic crystal with an electrically tunable photonic environment. The system consists of a nickel oxide (NiO) slab\, chosen for its low spin damping and temperature-dependent resonance frequency near 1.0 THz above room temperature\, placed adjacent to a nematic liquid-crystal cell and separated by a controlled gap of approximately 2.5 mm. The magnon frequency is tuned via the NiO temperature\, while an applied electric field reorients the liquid crystal\, modifying the cavity-mode frequencies and spatial field distributions. Using terahertz time-domain spectroscopy\, we measure reflection spectra as functions of temperature and applied voltage and observe voltage-controlled avoided crossings between cavity modes and magnons\, as well as changes in the magnon–photon coupling strength. These results demonstrate remote electrical control of antiferromagnetic magnon–polariton states at room temperature without direct physical contact between the magnetic material and the electrically active element. \nLien Zoom : https://univ-grenoble-alpes-fr.zoom.us/j/94228207316?pwd=khTdznxeFy1ZUYkYftQ0QSox6Fz3iK.1 \nReferences:\n[1] D. Yavorskiy et al\, ACS Photonics 12\, 5c01879 (2025)
URL:https://fermi.univ-tlse3.fr/event/terahertz-magnon-polariton-control-using-a-tunable-liquid-crystal-cavity-dmitriy-yavorskiy-lncmi-seminar-26-03-2026-14h/
CATEGORIES:Events,LNCMI,Seminars
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