BCS-BEC crossover in a trapped gas of Fermi atoms with a Feshbach resonance

Yoji Ohashi; Allan Griffin

doi:10.1016/S0921-4526(02)01904-X

BCS-BEC crossover in a trapped gas of Fermi atoms with a Feshbach resonance

Yoji Ohashi, Allan Griffin

Research output: Contribution to journal › Conference article › peer-review

1 Citation (Scopus)

Abstract

We present a theoretical study of the BCS-BEC (Bose-Einstein condensation) crossover in a trapped gas of Fermi atoms including the effect of a Feshbach resonance. Going past the simple mean field approximation, we include the effect of fluctuations in the strong coupling limit involving two kinds of Bose molecules, i.e., Feshbach molecules associated with the resonance and preformed Cooper-pairs in which the pairing interaction is mediated by Feshbach quasi-molecules. The superfluid phase transition is shown to change continuously from the BCS-type to a BEC of these two kinds of Bosons, as the threshold energy of the Feshbach resonance is lowered.

Original language	English
Pages (from-to)	40-41
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	329-333
DOIs	https://doi.org/10.1016/S0921-4526(02)01904-X
Publication status	Published - 2003 May
Externally published	Yes
Event	Proceedings of the 23rd international conference on low temper - Hiroshima, Japan Duration: 2002 Aug 20 → 2002 Aug 27

Keywords

BCS-BEC crossover
Cold gas of Fermi atoms
Feshbach resonance
Superfluidity

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1016/S0921-4526(02)01904-X

Cite this

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title = "BCS-BEC crossover in a trapped gas of Fermi atoms with a Feshbach resonance",

abstract = "We present a theoretical study of the BCS-BEC (Bose-Einstein condensation) crossover in a trapped gas of Fermi atoms including the effect of a Feshbach resonance. Going past the simple mean field approximation, we include the effect of fluctuations in the strong coupling limit involving two kinds of Bose molecules, i.e., Feshbach molecules associated with the resonance and preformed Cooper-pairs in which the pairing interaction is mediated by Feshbach quasi-molecules. The superfluid phase transition is shown to change continuously from the BCS-type to a BEC of these two kinds of Bosons, as the threshold energy of the Feshbach resonance is lowered.",

keywords = "BCS-BEC crossover, Cold gas of Fermi atoms, Feshbach resonance, Superfluidity",

author = "Yoji Ohashi and Allan Griffin",

note = "Funding Information: Y.O. was supported by a Japanese Overseas Research Fellowship. A.G. acknowledges support from NSERC of Canada.; Proceedings of the 23rd international conference on low temper ; Conference date: 20-08-2002 Through 27-08-2002",

year = "2003",

month = may,

doi = "10.1016/S0921-4526(02)01904-X",

language = "English",

volume = "329-333",

pages = "40--41",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier",

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TY - JOUR

T1 - BCS-BEC crossover in a trapped gas of Fermi atoms with a Feshbach resonance

AU - Ohashi, Yoji

AU - Griffin, Allan

N1 - Funding Information: Y.O. was supported by a Japanese Overseas Research Fellowship. A.G. acknowledges support from NSERC of Canada.

PY - 2003/5

Y1 - 2003/5

N2 - We present a theoretical study of the BCS-BEC (Bose-Einstein condensation) crossover in a trapped gas of Fermi atoms including the effect of a Feshbach resonance. Going past the simple mean field approximation, we include the effect of fluctuations in the strong coupling limit involving two kinds of Bose molecules, i.e., Feshbach molecules associated with the resonance and preformed Cooper-pairs in which the pairing interaction is mediated by Feshbach quasi-molecules. The superfluid phase transition is shown to change continuously from the BCS-type to a BEC of these two kinds of Bosons, as the threshold energy of the Feshbach resonance is lowered.

AB - We present a theoretical study of the BCS-BEC (Bose-Einstein condensation) crossover in a trapped gas of Fermi atoms including the effect of a Feshbach resonance. Going past the simple mean field approximation, we include the effect of fluctuations in the strong coupling limit involving two kinds of Bose molecules, i.e., Feshbach molecules associated with the resonance and preformed Cooper-pairs in which the pairing interaction is mediated by Feshbach quasi-molecules. The superfluid phase transition is shown to change continuously from the BCS-type to a BEC of these two kinds of Bosons, as the threshold energy of the Feshbach resonance is lowered.

KW - BCS-BEC crossover

KW - Cold gas of Fermi atoms

KW - Feshbach resonance

KW - Superfluidity

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UR - http://www.scopus.com/inward/citedby.url?scp=17044459118&partnerID=8YFLogxK

U2 - 10.1016/S0921-4526(02)01904-X

DO - 10.1016/S0921-4526(02)01904-X

M3 - Conference article

AN - SCOPUS:17044459118

SN - 0921-4526

VL - 329-333

SP - 40

EP - 41

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

T2 - Proceedings of the 23rd international conference on low temper

Y2 - 20 August 2002 through 27 August 2002

ER -

BCS-BEC crossover in a trapped gas of Fermi atoms with a Feshbach resonance

Abstract

Keywords

ASJC Scopus subject areas

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