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UID:0-694@lptms.universite-paris-saclay.fr
DTSTART;TZID=Europe/Paris:20191217T110000
DTEND;TZID=Europe/Paris:20191217T120000
DTSTAMP:20191211T103635Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-leticia-tarruell/
SUMMARY:Seminaire du LPTMS: Leticia Tarruell - Salle des séminaires du FAS
 T et du LPTMS\, bâtiment Pascal n°530 - 17 Déc 19 11:00
DESCRIPTION:Solitons and droplets in two-component Bose-Einstein condensate
 s\nLeticia Tarruell (ICFO-The Institute of Photonic Sciences\, Castelldefe
 ls)\n\nSelf-bound states appear in contexts as diverse as solitary waves i
 n channels\, optical solitons in non-linear media and liquid droplets. The
 ir binding results from a balance between attractive forces\, which tend t
 o make the system collapse\, and repulsive ones\, which stabilize it to a 
 finite size. This talk will present experiments on three different types o
 f self-bound states existing in two-component Bose-Einstein condensates.\n
 \nIn the first series of experiments\, we study dilute quantum liquid drop
 lets: macroscopic clusters of ultra-cold atoms that are eight orders of ma
 gnitude more dilute than liquid Helium\, but have similar liquid-like prop
 erties. In particular\, they remain self-trapped in the absence of externa
 l confinement due to the compensation of attractive mean-field forces and 
 an effective repulsion stemming from quantum fluctuations [1]. We experime
 ntally observe such droplets in a mixture of potassium Bose-Einstein conde
 nsates with repulsive intrastate and attractive interstate interactions [2
 ]\, and study their relation with more conventional bright solitons [3]. \
 n\nAs a second step\, we consider instead a system where each atom is plac
 ed in a coherent superposition of these two internal states. We measure th
 e elastic and inelastic properties of the gas\, and show that they can be 
 flexibly controlled via the parameters of the coupling field [4\,5]. In th
 e attractive regime\, we exploit this method to form bright solitons forme
 d by dressed-state atoms\, and to create bright soliton trains. \n\nFinall
 y\, we explore the situation where the coupling field imparts a momentum k
 ick to the atoms\, breaking Galilean invariance and creating an artificial
  vector potential. For potassium condensates\, the intrastate interactions
  have very different values and this synthetic gauge field becomes density
 -dependent [6]. We show that our system implements a one-dimensional Chern
 -Simons gauge theory that contains a chiral current term\, and experimenta
 lly observe the stabilization of chiral bright solitons.\n\n[1] D. S. Petr
 ov\, Phys. Rev. Lett. 115\, 155302 (2015)\n[2] C. R. Cabrera et al.\, Scie
 nce 359\, 301 (2018)\n[3] P. Cheiney et al.\, Phys. Rev. Lett. 120\, 13530
 1 (2018)\n[4] C. P. Search and P. R. Berman\, Phys. Rev. A 63\, 043612 (20
 01)\n[5] D. S. Petrov\, Phys. Rev. Lett. 112\, 103201 (2014)\n[6] M. J. Ed
 monds et al.\, Phys. Rev. Lett. 110\, 085301 (2013)
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
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TZID:Europe/Paris
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BEGIN:STANDARD
DTSTART:20191027T020000
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TZOFFSETTO:+0100
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