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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-333@lptms.universite-paris-saclay.fr
DTSTART:20150224T110000Z
DTEND:20150224T120000Z
DTSTAMP:20150216T152506Z
URL:https://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lpt
 ms-andrii-gudyma/
SUMMARY:Séminaire du LPTMS: Andrii Gudyma - LPTMS\, salle 201\, 2ème éta
 ge\, Bât 100\, Campus d'Orsay - 24 Fév 15 11:00
DESCRIPTION:Breathing modes of one-dimensional trapped BEC\nAndrii Gudyma (
 LPTMS)\nWe calculate the breathing mode frequency in a one-dimensional Bos
 e gas confined to a harmonic trap. We predict a smooth crossover from Thom
 as–Fermi Bose–Einstein condensate (BEC) regime to Gaussian BEC regime 
 using Hartree approximation and sum rules approach\, adopted to small syst
 em sizes. Local density approximation (LDA) correctly captures the crossov
 er from Tonks-Girardeau to Thomas-Fermi BEC regimes. Hartree and LDA predi
 ctions can be continuously matched for N &gt\; 25 particles\, providing a 
 complete zero-temperature description for large number of particles and re
 sulting in a non-monotonic reentrant behavior of the breathing frequency. 
 For smaller number of particles (ranging from N = 2 to N = 25) we perform 
 extensive diffusion Monte Carlo simulations. This permits us to obtain a c
 omplete picture\, applicable to arbitrary number of particles and any repu
 lsive interaction strength. We provide perturbative analysis for both weak
  and strong coupling regimes. We revisit Innsbrick group experiment [Scien
 ce 325\, 1224 (2009)]\, analyzing the measurements done in Thomas–Fermi 
 Gaussian BEC crossover\, and demonstrate that the breathing frequency foll
 ows a reentrant behavior as a function of the interaction strength in full
  agreement with our theory.\n\n
LOCATION:LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay\, 15 
 Rue Georges Clemenceau\, Orsay\, 91405\, France
GEO:48.698185;2.181768
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=15 Rue Georges Clemenceau\,
  Orsay\, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=LPTMS\, salle 201\, 2è
 me étage\, Bât 100\, Campus d'Orsay:geo:48.698185,2.181768
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