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Journal of Physics Conference Series

Permanent-magnet atom chips for the study of long, thin atom clouds

Isabel Llorente‐Garcia, Christopher D. J. Sinclair, E. A. Curtis, S. Eriksson, B. E. Sauer, E. A. Hinds

Published Jan 1, 2005• 3 citations
Publisher

Abstract

Atom-chip technology can be used to confine atoms tightly using permanently magnetised videotape along with external magnetic fields. The one-dimensional (1D) gas regime can be realised and studied by trapping the atoms in high-aspect-ratio traps in which the radial motion of the system is confined to zero-point oscillation.
DOI
10.1088/1742-6596/19/1/011

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We have produced a Bose-Einstein condensate on a permanent-magnet atom chip based on periodically magnetized videotape. We observe the expansion and dynamics of the condensate in one of the microscopic waveguides close to the surface. The lifetime for atoms to remain trapped near this dielectric material is significantly longer than above a metal surface of the same thickness. These results illustrate the suitability of microscopic permanent-magnet structures for quantum-coherent preparation and manipulation of cold atoms.
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This paper reports on experiments with ultracold rubidium atoms confined in microscopic magnetic traps created using a piece of periodically magnetized videotape mounted on an atom chip. The roughness of the confining potential is studied with atomic clouds at temperatures of a few μK and at distances between 30 and 80 μm from the videotape-chip surface. The inhomogeneities in the magnetic field created by the magnetized videotape close to the central region of the chip are characterized in this way. In addition, we demonstrate a novel transport mechanism whereby we convey cold atoms confined in arrays of videotape magnetic micro-traps over distances as large as ∼1 cm parallel to the chip surface. This conveying mechanism enables us to survey the surface of the chip and observe potential-roughness effects across different regions.