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SUMMARY:Unitary gases
DTSTART;VALUE=DATE-TIME:20130130T080000Z
DTEND;VALUE=DATE-TIME:20130130T090000Z
DTSTAMP;VALUE=DATE-TIME:20191212T210149Z
UID:indico-event-5854@agenda.infn.it
DESCRIPTION:In cold atom experiments one can adjust at will the atomic int
eraction strength: with a simple application of a magnetic field\, one can
in principle tune the s-wave scattering length from minus infinity to plu
s infinity. For spin 1/2 fermions this has in particular led to the first
observation of the crossover between a BCS state of Cooper pairs and a Bos
e-Einstein Condensate of dimers [1\,2].\nIn this theoretical talk\, we sha
ll focus on the particularly fascinating case of an infinite scattering le
ngth. For spin 1/2 fermions\, this leads to the so-called unitary gas\, wh
ich was recently the subject of precise equation-of-state measurements/num
erical calculations [3\,4]. We shall review the intriguing physical conseq
uences of scaling invariance of this maximally interacting gas\, and make
the link with Efimov physics:\n- mathematical representation by the Wigner
-Bethe-Peierls (or zero-range) model [5] - dynamical consequences of the s
caling invariant\, and SO(2\,1) hidden symmetry in a trap [6] - does the u
nitary gas really exist ? The threat of a generalized Efimov effect [7] -
effect of mass imbalance between the two components: the single impurity p
roblem\, three-body [8] and four-body [9] Efimov effects - what about the
mysterious ”unitary Bose gas” ?\n\nhttps://agenda.infn.it/event/5854/
LOCATION:LNF Aula Bruno Touschek
URL:https://agenda.infn.it/event/5854/
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