Atom-molecule coherence in Bose gases

By R. Duine, Henk T. C. Stoof. 2003

162 citations recorded by the source corpus.

Abstract In an atomic gas near a Feshbach resonance, the energy of two colliding atoms is close to the energy of a bound state, i.e., a molecular state, in a closed channel that is coupled to the incoming open channel. Due to the different spin arrangements of the atoms in the open channel and the atoms in the molecular state, the energy difference between the bound state and the two-atom continuum threshold is experimentally accessible by means of the Zeeman interaction of the atomic spins with a magnetic field. As a result, it is in principle possible to vary the scattering length to any value by tuning the magnetic field. This level of experimental control has opened the road for many beautiful experiments, which recently led to the demonstration of coherence between atoms and molecules. This is achieved by observing coherent oscillations between atoms and molecules, analogous to coherent Rabi oscillations that occur in ordinary two-level systems. We review the many-body theory that describes coherence between atoms and molecules in terms of an effective quantum field theory for Feshbach-resonant interactions. The most important feature of this effective quantum field theory is that it incorporates the two-atom physics of the Feshbach resonance exactly, which turns out to be necessary to fully explain experiments with Bose–Einstein condensed atomic gases.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/0b0b16920b7356f8d1d53173bf6ad10052139637

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In Artificial Intelligence

1. X. Guan
2. C. Chin
3. R. Grimm
4. Chaohong Lee
5. Tiberiu Harko
6. M. Batchelor
7. P. Julienne
8. E. Tiesinga

In Atomic and Molecular Physics, and Optics

1. C. Chin
2. R. Grimm
3. M. Zwierlein
4. P. Julienne
5. E. Tiesinga
6. W. Ketterle
7. Tiberiu Harko
8. X. Guan

In Statistical and Nonlinear Physics

1. C. Chin
2. R. Grimm
3. Tiberiu Harko
4. W. Ketterle
5. M. Batchelor
6. P. Julienne
7. M. Zwierlein
8. E. Tiesinga

Citations in the corpus

• Making, probing and understanding ultracold Fermi gases (2008, background): “Good insight into the Feshbach resonance mechanism can be gained by considering two coupled spherical well potentials, one each for the open and closed channel [262].”
• Production of cold molecules via magnetically tunable Feshbach resonances (2006, unknown): “( 47 ) ( Duine and Stoof , 2004 ) .”
• Feshbach resonances in ultracold gases (2008, methodology): “, 2002) and (Duine and Stoof, 2004) have introduced 2-channel square well models to represent Feshbach resonances in ultracold atom scattering.”
• Evolution of cosmological perturbations in Bose–Einstein condensate dark matter (2011, background): “…of laser and evaporative cooling techniques, opening several new lines of research, at the border of atomic, statistical and condensed matter physics (Dalfovo et al. 1999; Cornell & Wieman 2002; Ketterle 2002; Pitaevskii & Stringari 2003; Duine & Stoof 2004; Chen et al. 2005; Pethick & Smith 2008).”
• Fermi gases in one dimension: From Bethe ansatz to experiments (2013, background): “The theory of Feshbach resonances in ultracold atomic gases has been introduced in (Duine and Stoof, 2004).”