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DTSTAMP:20261005T201727Z
LAST-MODIFIED:20210407T174711Z
DTSTART:20210409T160000Z
DTEND:20210409T170000Z
UID:event2424@bu.edu
URL:http://physics.bu.edu/internal/events/show/2424
SUMMARY:Testing Scale Invariance in the lab: Solitons and Breathers for 2D 
	Bose gases 
DESCRIPTION:Featuring Jean Dalibard\, College de France\n\nPart of the Biop
	hysics/Condensed Matter Seminar Series.\n\nA fluid is said to be scale-inva
	riant when its interaction and kinetic energies have the same scaling in a 
	dilatation operation. This symmetry\, in association with the more general 
	conformal invariance\, has profound consequences on the equilibrium propert
	ies of the fluid as well as its dynamics. \nIn this talk\, I will present r
	ecent experimental investigations of scale invariance using a 2D gas of rub
	idium atoms\, whose dynamics is well described by a non-linear Schrödinger
	 (Gross-Pitaevskii) equation. I will show some expected results for this sy
	stem\, such as the observation of 2D solitons\, as well as (a priori) unexp
	ected ones such as the existence of breathers\, i.e. specific initial shape
	s that undergo a periodic evolution when placed in a harmonic potential. I 
	will conclude with a possible generalization of such phenomena to other sca
	le invariant fluids.\n \n[1] B. Bakkali-Hassani\, C. Maury\, Y.-Q. Zou\, E.
	 Le Cerf\, R. Saint-Jalm\, P.C.M. Castilho\, S. Nascimbene\, J. Dalibard\, 
	J. Beugnon\, arXiv:2103.0160: Realization of a Townes soliton in a two-comp
	onent planar Bose gas\n\n[2] R. Saint-Jalm\, P.C.M. Castilho\, E. Le Cerf\,
	 B. Bakkali-Hassani\, J.-L. Ville\, S. Nascimbene\, J. Beugnon\, J. Dalibar
	d\, Phys. Rev. X 9\, 021035 (2019): Dynamical symmetry and breathers in a t
	wo-dimensional Bose gas
LOCATION: \, \, 
STATUS:CONFIRMED
CLASS:PUBLIC
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