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New Directions in Degenerate Dipolar Molecules via Collective Association | | Matt Mackie
; Olavi Dannenberg
; Jyrki Piilo
; Kalle-Antti Suominen
; Juha Javanainen
; | | Date: |
16 Jun 2004 | | Journal: | Eur. Phys. J. D 31, 273 (2004) DOI: 10.1140/epjd/e2004-00122-3 | | Subject: | Atomic Physics; Chemical Physics; Soft Condensed Matter; Superconductivity | physics.atom-ph cond-mat.soft cond-mat.supr-con physics.chem-ph quant-ph | | Abstract: | We survey results on the creation of heteronuclear Fermi molecules by tuning a degenerate Bose-Fermi mixture into the neighborhood of an association resonance, either photoassociation or Feshbach, as well as the subsequent prospects for Cooper-like pairing between atoms and molecules. In the simplest case of only one molecular state, corresponding to either a Feshbach resonance or one-color photoassociation, the system displays Rabi oscillations and rapid adiabatic passage between a Bose-Fermi mixture of atoms and fermionic molecules. For two-color photoassociation, the system admits stimulated Raman adiabatic passage (STIRAP) from a Bose-Fermi mixture of atoms to stable Fermi molecules, even in the presence of particle-particle interactions. By tailoring the STIRAP sequence it is possible to deliberately convert only a fraction of the initial atoms, leaving a finite fraction of bosons behind to induce atom-molecule Cooper pairing via density fluctuations; unfortunately, this enhancement is insufficient to achieve a superfluid transition with present ultracold technology. We therefore propose the use of an association resonance that converts atoms and diatomic molecules (dimers) into triatomic molecules (trimers), which leads to a crossover from a Bose-Einstein condensate of trimers to atom-dimer Cooper pairs. Because heteronuclear dimers may possess a permanent electric dipole moment, this overall system presents an opportunity to investigate novel microscopic physics. | | Source: | arXiv, physics/0406074 | | Services: | Forum | Review | PDF | Favorites | |
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