Diapositiva 1

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Research and Development Center on Bose-Einstein
Condensation (CRS-BEC)
CNR-INFM

• - Founded by INFM (Istituto Nazionale per la
  Fisica della Materia) June 2002
• - Hosted by University of Trento (Physics
  Department)
• Director Sandro Stringari
• Scientific Committee Jean Dalibard (ENS Paris)
• Chris
  Pethick (Nordita)
• Williams
  Phillips (NIST)
• Gora
  Shlyapnikov (Orsay)
• Peter
  Zoller (Innsbruck)

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• Main goals
• Promote theoretical research in the field of
  ultracold atomic gases
• (emerging field after the experimental
  realization of BEC in 1995)
• Reinforce intersciplinarity (atomic and
  molecular physics,
• nucleqr physics, quantum optics, statistical
  mechanicsm
• and condensed matter physics)
• - Strengthen collaborations with experimental
  activities around the world

• University Franco Dalfovo
• Stefano Giorgini
• Lev Pitaevskii
• Sandro Stringari
• CNR-INFM Augusto Smerzi
• Tommaso Calarco
• Iacopo Carusotto
• Chiara Menotti
• Postdoc
• 5 Phd and Diploma Students

Research Staff (March 2007)
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Main fields of interest Rotating quantum
gases, Low
dimensions,
Excitations in BEC, atoms in optical lattices,
Quantum
optics,
Superfluid Fermi gases,
Quantum simulations,
Quantum information,
Quantum
interferometry,
Casimir- Polder force
Scientific papers published since 2002
206 Papers published on Physical Review Letters
48
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EXPANSION OF FERMI SUPERFLUID
Hydrodynamics predicts anisotropic expansion in
Fermi superfluids (Menotti et al, 2002)
HD theory
Evidence for hydrodynamic anisotropic expansion
in ultra cold Fermi gas (OHara et al, 2003)
normal collisionless
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Radial breathing mode in superfluid Fermi gas
MC equation of state (Astrakharchick et al.,
2005)
Exp. Innsbruck, 2007
includes Lee, Huang,Yang effect
does not include LHY effect
BCS mean field (Hu et al., 2004)
Measurement of collective frequencies provides
accurate test of equation of state !!
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Behaviour of Bogoliubov phonons in expanding
BECs TheoryExpt, collaboration between Trento
BEC and Weizmann Institute
Bragg spectroscopy of the multi-branch Bogoliubov
spectrum of elongated Bose-Einstein
condensates, J.Steinhauer, N.Katz, R.Ozeri,
N.Davidson, C.Tozzo, and F.Dalfovo, PRL 90,
060404 (2003) High sensitivity phonon
spectroscopy of Bose-Einstein condensates using
matter-wave interference, N. Katz, R. Ozeri, N.
Davidson, C. Tozzo, and F. Dalfovo, PRL 93,
220403 (2004)
Theory
Expt
Fringe visibility
Low k
High k
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BEC in a double-well
Theory
Exp
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Spin polarized Fermi gases in situ density
difference (MIT 2006)
In superfluid phase In polarized normal phase


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Shell structure in trapped spin polarized Fermi
gas
(C. Lobo A. Recati, S. Giorgini and S. Stringari,
PRL 2006)
N
S
Predicted value for critical polarization in good
agreement with MIT result (0.77)
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(Center of mass oscillation of BEC trapped near
a substrate) Boulder-Trento collaboration
Relative frequency shift
Theory predicts
rather than Lifshit result

at thermal equilibrium