BEGIN:VCALENDAR VERSION:2.0 PRODID:-//wp-events-plugin.com//6.4.7.2//EN TZID:Europe/Paris X-WR-TIMEZONE:Europe/Paris BEGIN:VEVENT UID:0-1099@lptms.universite-paris-saclay.fr DTSTART;TZID=Europe/Paris:20260310T110000 DTEND;TZID=Europe/Paris:20260310T120000 DTSTAMP:20260226T101747Z URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm s-manuele-landini-university-of-innsbruck/ SUMMARY:LPTMS Seminar: Manuele Landini (University of Innsbruck) - Salle de s séminaires du FAST et du LPTMS\, bâtiment Pascal n°530 - 10 Mar 26 11 :00 DESCRIPTION:Probing ultracold 1D systems out of equilibrium\nManuele Landin i (University of Innsbruck)\n \;\n\nI will present the activities of o ur group\, going under the broad topic of out of equilibrium phenomena in ultracold 1D gases. In our experiment\, an ensemble of a few thousand effe ctively one dimensional ultracold Cs samples\, each containing 10 to 30 at oms is prepared and investigated. Careful control over the trapping potent ial\, temperature and interaction energy enables the investigation of coll ective quantum transport behavior of these systems and the preparation of out of equilibrium states with unusual statistical properties. The control over interaction strength in our Cs experiment allows us to perform topol ogical pumping experiments by cycling the value of the coupling constant. In each cycle\, the system is promoted to increasingly more energetic many -body states\, stabilized by approximate integrability. These states are c haracterized by the presence of fractional Fermi seas (FFS) resulting from effective “hyperfermionic” statistics\, where each particle occupies more than one quantum state. The creation of the FFS is inferred in the ex periment by the direct observation of Friedel oscillations in the g1 corre lation function of the gas [1\,2]. Introducing spin impurities with variab le speed in the 1D gas\, we were able to characterize their relaxation dyn amics and infer the formation of a polaron\, resulting in finite long-time velocity of the impurity\, even though the system is not in a standard su perfluid state [3]. By slowly accelerating the impurity across the polaron ic dispersion\, we could observe its momentum distribution\, revealing a c ross-over in the effective statistical behavior of the system from bosonic to fermionic\, passing from the anyonic intermediate statistics as a func tion of the injected momentum [4].\n\n[1] Realization of fractional Fermi seas\, Y. Zeng\, A. Bastianello\, S. Dhar\, Z. Wang\, X. Yu\, M. Horvath\, G. E. Astrakharchik\, Y. Guo\, H.-C. Nägerl\, M. Landini\, arXiv:2602.17 657 (2026).\n\n[2] Exotic critical states as fractional Fermi seas in the one-dimensional Bose gas\, A. Bastianello\, Y. Zeng\, S. Dhar\, Z. Wang\, X. Yu\, M. Horvath\, G. E. Astrakharchik\, Y. Guo\, H.-C. Nägerl\, M. Lan dini\, arXiv:2602.17656 (2026).\n\n[3] Observing dissipationless flow of a n impurity in a strongly repulsive quantum fluid\, M. Horvath\, S. Dhar\, E. Wybo\, D. Trypogeorgos\, Y. Guo\, M. B. Zvonarev\, M. Knap\, M. Landini \, H.-C. Nägerl\, arXiv:2602.12320 (2026).\n\n[4] Observing anyonization of bosons in a quantum gas\, S. Dhar\, B. Wang\, M. Horvath\, A. Vashisht\ , Y. Zeng\, M. B. Zvonarev\, N. Goldman\, Y. Guo\, M. Landini\, H.-C. Näg erl\, Nature\, 642\, 53–57 (2025). CATEGORIES:seminars LOCATION:Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°53 0\, rue André Riviere\, Orsay\, 91405\, France X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=rue André Riviere\, Orsay\ , 91405\, France;X-APPLE-RADIUS=100;X-TITLE=Salle des séminaires du FAST et du LPTMS\, bâtiment Pascal n°530:geo:0,0 END:VEVENT BEGIN:VTIMEZONE TZID:Europe/Paris X-LIC-LOCATION:Europe/Paris BEGIN:STANDARD DTSTART:20251026T020000 TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET END:STANDARD END:VTIMEZONE END:VCALENDAR