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Few-body physics of ultracold atoms and molecules in confined geometry . Vladimir Melezhik . Bogoliubov Lab. of Theoretical Physics, JINR, Dubna. Outline:. Experimental achievements (laser cooling, optical traps, atomic chips) . - PowerPoint PPT Presentation
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Few-body physics of ultracold atoms and molecules in confined geometry
Vladimir Melezhik
Bogoliubov Lab. of Theoretical Physics, JINR, Dubna
Outline:
Experimental achievements (laser cooling, optical traps, atomic chips)
New physics: quantum gases, physics of Bose-Einstein condensations
Problems: low-dimensional few-body physics
Theoretical models (simple ones)
Resent results (extended models)
Perspectives, what is going to happen ?
3-5 Feb 2010, Dubna
Creation of ultracold atoms and molecules (quantum gases)
Progress in production of ultracold atoms and molecules: laser cooling
V.S.Letokhov,V.G.Minogin andB.D.Pavlik, ZhTPH, 72, 1328 (1977)
Steven Chu Claude Cohen-Tannoudji William D. PhillipsThe Nobel Prize in Physics 1997
Dilute gas two distance scales:
and
Boltsmann gas
Quantum statistics
bosons
BEC
= macroscopic occupation of a single quantum state
BEC objects
Neutron stars
R
Superfluid
Dilute atomic gases
Exitones in semiconductors
Collective behavior of extremely dilute systemsGeneration of coherent matter waves
Status at about 2005-2008
2009
ultracold atoms in optical traps, atomic chips, quantum wires
Two-Body Problem in Restricted Geometry:a) Quantization in the direction of the confinement
+
Botsmann gas quantum gass
Two-body problem in confined geometry
non-separable two-body problem
simple model: pseudopotential approach (zero-range potential)
Isotropic confinement:
Physical interpretation of CIR
• CIR is a zero-energy Feshbach resonance, occurring when the energy of a bound state of the asymptotically closed channels coincides with the continuum threshold of the open channel.
Experimental observation of CIR
strongly-correlated Tonk-Girardeau gas
(Innsbruck )
B
What happens if atoms scatter in excited states?
E
What happens in collision of two distinguishable particles in a harmonic waveguide if ?
What happens if inelastic collisions? Molecule formation?