Cold atoms probe the magnetic field near a wire

Jones, M P A, Vale, C J, Sahagun, D, Hall, B V, Eberlein, C C, Sauer, BE, Furusawa, K, Richardson, D and Hinds, E A (2004) Cold atoms probe the magnetic field near a wire. Journal of Physics B, 37. L15-L20. ISSN 0953-4075

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A microscopic IoffePritchard trap is formed using a straight, current-carrying wire, together with suitable auxiliary magnetic fields. By measuring the distribution of cold rubidium atoms held in this trap, we detect a weak magnetic field component Delta Bz parallel to the wire. This is produced by the current in the wire and is approximately periodic along the wire with period lambda = 230 m. We have measured this field at distances in the range y = 250-350 m from the centre of the wire. Over this range we find that the decrease of the field is well described by the Bessel function K1(2 pi y/lambda), as one would expect for the far field of a transversely oscillating current within the wire.

Item Type: Article
Additional Information: A BEC is used to measure the magnetic field close to a wire, which may be due to a helical current. This work provided the strongest indication yet as to what causes condensates to break up close to current-carrying structures. I did the calculations for the experimental team.
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Claudia Eberlein
Date Deposited: 06 Feb 2012 19:23
Last Modified: 30 Nov 2012 17:03
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