Bogoliubov theory of Feshbach molecules in the BEC-BCS crossover

M. W. J. Romans; H. T. C. Stoof

doi:10.1103/PhysRevA.74.053618

Bogoliubov theory of Feshbach molecules in the BEC-BCS crossover

M. W. J. Romans^*, H. T. C. Stoof

^*Corresponding author for this work

Utrecht University

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

We present the Bogoliubov theory for the Bose-Einstein condensation of Feshbach molecules in a balanced Fermi mixture. Because the Bogoliubov theory includes (Gaussian) fluctuations, we can in this manner accurately incorporate both the two-body and many-body aspects of the BEC-BCS crossover that occurs near a Feshbach resonance. We apply the theory in particular to the very broad Feshbach resonance in atomic Li-6 at a magnetic field of B-0=834 G and find good agreement with experiments in that case. The BEC-BCS crossover for more narrow Feshbach resonances is also discussed.

Original language	English
Article number	053618
Number of pages	15
Journal	Physical review. A, Atomic, molecular and optical physics
Volume	74
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevA.74.053618
Publication status	Published - Nov 2006

Keywords

BOSE-EINSTEIN CONDENSATION
GINZBURG-LANDAU THEORY
NUCLEAR REACTIONS
UNIFIED THEORY
ATOMIC GAS
SUPERCONDUCTIVITY
RESONANCES
WEAK

Access to Document

10.1103/PhysRevA.74.053618

Cite this

@article{658a31fea8aa466397c5313e0db3ed14,

title = "Bogoliubov theory of Feshbach molecules in the BEC-BCS crossover",

abstract = "We present the Bogoliubov theory for the Bose-Einstein condensation of Feshbach molecules in a balanced Fermi mixture. Because the Bogoliubov theory includes (Gaussian) fluctuations, we can in this manner accurately incorporate both the two-body and many-body aspects of the BEC-BCS crossover that occurs near a Feshbach resonance. We apply the theory in particular to the very broad Feshbach resonance in atomic Li-6 at a magnetic field of B-0=834 G and find good agreement with experiments in that case. The BEC-BCS crossover for more narrow Feshbach resonances is also discussed.",

keywords = "BOSE-EINSTEIN CONDENSATION, GINZBURG-LANDAU THEORY, NUCLEAR REACTIONS, UNIFIED THEORY, ATOMIC GAS, SUPERCONDUCTIVITY, RESONANCES, WEAK",

author = "Romans, {M. W. J.} and Stoof, {H. T. C.}",

year = "2006",

month = nov,

doi = "10.1103/PhysRevA.74.053618",

language = "English",

volume = "74",

journal = "Physical review. A, Atomic, molecular and optical physics",

issn = "1050-2947",

publisher = "American Physical Society",

number = "5",

}

TY - JOUR

T1 - Bogoliubov theory of Feshbach molecules in the BEC-BCS crossover

AU - Romans, M. W. J.

AU - Stoof, H. T. C.

PY - 2006/11

Y1 - 2006/11

N2 - We present the Bogoliubov theory for the Bose-Einstein condensation of Feshbach molecules in a balanced Fermi mixture. Because the Bogoliubov theory includes (Gaussian) fluctuations, we can in this manner accurately incorporate both the two-body and many-body aspects of the BEC-BCS crossover that occurs near a Feshbach resonance. We apply the theory in particular to the very broad Feshbach resonance in atomic Li-6 at a magnetic field of B-0=834 G and find good agreement with experiments in that case. The BEC-BCS crossover for more narrow Feshbach resonances is also discussed.

AB - We present the Bogoliubov theory for the Bose-Einstein condensation of Feshbach molecules in a balanced Fermi mixture. Because the Bogoliubov theory includes (Gaussian) fluctuations, we can in this manner accurately incorporate both the two-body and many-body aspects of the BEC-BCS crossover that occurs near a Feshbach resonance. We apply the theory in particular to the very broad Feshbach resonance in atomic Li-6 at a magnetic field of B-0=834 G and find good agreement with experiments in that case. The BEC-BCS crossover for more narrow Feshbach resonances is also discussed.

KW - BOSE-EINSTEIN CONDENSATION

KW - GINZBURG-LANDAU THEORY

KW - NUCLEAR REACTIONS

KW - UNIFIED THEORY

KW - ATOMIC GAS

KW - SUPERCONDUCTIVITY

KW - RESONANCES

KW - WEAK

U2 - 10.1103/PhysRevA.74.053618

DO - 10.1103/PhysRevA.74.053618

M3 - Article

SN - 1050-2947

VL - 74

JO - Physical review. A, Atomic, molecular and optical physics

JF - Physical review. A, Atomic, molecular and optical physics

IS - 5

M1 - 053618

ER -

Bogoliubov theory of Feshbach molecules in the BEC-BCS crossover

Abstract

Keywords

Access to Document

Fingerprint

Cite this