dorsal/arxiv
View SchemaNew Directions in Degenerate Dipolar Molecules via Collective Association
| Authors | Matt Mackie, Olavi Dannenberg, Jyrki Piilo, Kalle-Antti Suominen, Juha Javanainen |
|---|---|
| Categories | |
| ArXiv ID | physics/0406074 |
| URL | https://arxiv.org/abs/physics/0406074 |
| DOI | 10.1140/epjd/e2004-00122-3 |
| Journal | Eur. Phys. J. D 31, 273 (2004) |
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.
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"abstract": "We survey results on the creation of heteronuclear Fermi molecules by tuning\na degenerate Bose-Fermi mixture into the neighborhood of an association\nresonance, either photoassociation or Feshbach, as well as the subsequent\nprospects for Cooper-like pairing between atoms and molecules. In the simplest\ncase of only one molecular state, corresponding to either a Feshbach resonance\nor one-color photoassociation, the system displays Rabi oscillations and rapid\nadiabatic passage between a Bose-Fermi mixture of atoms and fermionic\nmolecules. For two-color photoassociation, the system admits stimulated Raman\nadiabatic passage (STIRAP) from a Bose-Fermi mixture of atoms to stable Fermi\nmolecules, even in the presence of particle-particle interactions. By tailoring\nthe STIRAP sequence it is possible to deliberately convert only a fraction of\nthe initial atoms, leaving a finite fraction of bosons behind to induce\natom-molecule Cooper pairing via density fluctuations; unfortunately, this\nenhancement is insufficient to achieve a superfluid transition with present\nultracold technology. We therefore propose the use of an association resonance\nthat converts atoms and diatomic molecules (dimers) into triatomic molecules\n(trimers), which leads to a crossover from a Bose-Einstein condensate of\ntrimers to atom-dimer Cooper pairs. Because heteronuclear dimers may possess a\npermanent electric dipole moment, this overall system presents an opportunity\nto investigate novel microscopic physics.",
"arxiv_id": "physics/0406074",
"authors": [
"Matt Mackie",
"Olavi Dannenberg",
"Jyrki Piilo",
"Kalle-Antti Suominen",
"Juha Javanainen"
],
"categories": [
"physics.atom-ph",
"cond-mat.soft",
"cond-mat.supr-con",
"physics.chem-ph",
"quant-ph"
],
"doi": "10.1140/epjd/e2004-00122-3",
"journal_ref": "Eur. Phys. J. D 31, 273 (2004)",
"title": "New Directions in Degenerate Dipolar Molecules via Collective Association",
"url": "https://arxiv.org/abs/physics/0406074"
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