2003
DOI: 10.1007/s00340-003-1334-0
|View full text |Cite
|
Sign up to set email alerts
|

Dipolar relaxation in an ultra-cold gas of magnetically trapped chromium atoms

Abstract: We have investigated both theoretically and experimentally dipolar relaxation in a gas of magnetically trapped chromium atoms. We have found that the large magnetic moment of 6 µ B results in an event rate coefficient for dipolar relaxation processes of up to 3.2 · 10 −11 cm 3 s −1 at a magnetic field of 44 G. We present a theoretical model based on pure dipolar coupling, which predicts dipolar relaxation rates in agreement with our experimental observations. This very general approach can be applied to a larg… Show more

Help me understand this report
View preprint versions

Search citation statements

Order By: Relevance

Paper Sections

Select...
1
1

Citation Types

12
156
1

Year Published

2005
2005
2013
2013

Publication Types

Select...
8
1

Relationship

3
6

Authors

Journals

citations
Cited by 97 publications
(169 citation statements)
references
References 21 publications
12
156
1
Order By: Relevance
“…Averaging over the inter-particle velocities we consider that the atomic depolarization can occur via single or double spin flip. The measurement of β dr ∼ 10 −13 cm 2 /s results in good agreement with theoretical predictions based on 1 st order Born approximation for dipole-dipole interaction [11].…”
supporting
confidence: 86%
See 1 more Smart Citation
“…Averaging over the inter-particle velocities we consider that the atomic depolarization can occur via single or double spin flip. The measurement of β dr ∼ 10 −13 cm 2 /s results in good agreement with theoretical predictions based on 1 st order Born approximation for dipole-dipole interaction [11].…”
supporting
confidence: 86%
“…Magnetic dipoledipole interaction can induce inelastic relaxations with a rate that drastically increase with the atomic magnetic moments. In particular the cross section for the inelastic single spin-flip (only one atom changes its m J value by one) is proportional to J 3 [11]. In [10], particular attention has been paid to chromium atomic gases [12] because grounded Cr 7 S 3 atoms possess very large magnetic dipole moments of six Bohr magnetons.…”
mentioning
confidence: 99%
“…In this situation, the energy shift is given by 5) where I(r) is the intensity of the laser. In the dressed atom picture, the energy shift (2.5) is interpreted as an effective potential V opt (r) = ∆E(r), that follows the spatial pattern of the laser field intensity, in which the atom moves.…”
Section: Optical Latticesmentioning
confidence: 99%
“…Therefore, the two-body loss parameter that we expect for this rf-assisted mechanism is on the same order of magnitude as K rel 2 , the twobody loss parameter for dipolar relaxation in a static field B eq ≈h ω gJ µB . Given the known value for K rel 2 [13], and our typical BEC density, a typical lifetime of a few tens of ms is expected at large rf power. Although a full quantitative analysis is beyond the scope of this paper, we represent in Fig 4 the evolution of the gap we have calculated as a function of rf power.…”
mentioning
confidence: 89%