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SUMMARY:Lauriane Chomaz: "Ultracold dipolar Bose gases of magnetic atoms: 
 roton excitations\, quantum stabilization\, droplets and supersolid states
 "
DTSTART:20260424T073000Z
DTEND:20260424T100000Z
DTSTAMP:20260430T221000Z
UID:indico-event-16458@indico.math.cnrs.fr
DESCRIPTION:Speakers: Lauriane Chomaz\n\nThanks to their high degree of co
 ntrol and tunability\, ultracold atomic gases provide a rich platform for 
 the study of quantum many-body effects. Ultracold gases of highly magnetic
  atoms exhibit unique interaction properties that lead to striking behavio
 rs\, both at the mean-field level and beyond [1]. At mean field\, dependin
 g on the gas geometry\, the competition of contact and long-range dipolar 
 interaction may yield novel excitation features\, including a roton mode r
 eminiscent of the physics of superfluid helium\, and modifies the stabilit
 y of the system.  Furthermore\, a universal stabilization mechanism driv
 en by beyond mean field effects and preventing the gas to collapse at the 
 mean-field instability was experimentally discovered a decade ago. This me
 chanism allows the emergence of exotic states of matter\, including ultrad
 ilute quantum droplets\, crystallized quantum states\, and – most notabl
 y – supersolids\, which combine the seemingly antithetical properties of
  superfluids and solids [2]. \nIn my talk\, I will review the physics of 
 dipolar quantum Bose gases\, including roton excitations\, stabilization b
 eyond mean field\, and stabilized states. I will outline the theoretical d
 escription of these systems via an effective mean-field treatment\, includ
 ing the effect of quantum fluctuations via an effective higher-order inter
 action. I will describe the seminal observations of these phenomena in gas
 es of magnetic atoms and how they were made possible from the long-standin
 g progress in the field. I will present our current understanding of the p
 roperties of the stabilized states and in particular of dipolar supersolid
 s\, as well as the ongoing research in my group at Heidelberg University\,
  where we explore quantum phase transitions between dipolar supersolids wi
 th different crystal organization [3].\nReferences\n[1] L. Chomaz et al.\,
  "Dipolar physics: A review of experiments with magnetic quantum gases\," 
 Reports on Progress in Physics 86\, 026401 (2023)\n[2] L. Chomaz\, "Quan
 tum-stabilized states in magnetic dipolar quantum gases." Annual Review o
 f Condensed Matter Physics 17 (2025)\n[3] K. Chandrashekara et al.\, in 
 preparation (2026)\n\nhttps://indico.math.cnrs.fr/event/16458/
LOCATION:M7-411 (ENS Lyon)
URL:https://indico.math.cnrs.fr/event/16458/
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