Cold atoms close to surfaces: measuring magnetic field roughness and disorder potentials
2005 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 19, no 1, 56-65 p.Article in journal (Refereed) Published
Microscopic atom optical devices integrated on atom chips allow to precisely control and manipulate ultra-cold ( T < 1 ÂµK) neutral atoms and Bose-Einstein condensates (BECs) close to surfaces. The relevant energy scale of a BEC is extremely small (down to < 10 âˆ’11 eV). Consequently, BECs can be utilized as a sensor for variations of the potential energy of the atoms close to the surface. Here we describe how to use trapped atoms as a measurement device and analyze the performance and flexibility of the field sensor. We demonstrate microscopic magnetic imaging with simultaneous high spatial resolution (3 Âµm) and high field sensitivity (4 nT). With one dimensional BECs, we probe the magnetic field variations close to the surface at distances down to a few microns. Measurements of the magnetic field of a 100 Âµm wide current carrying wire imply that the magnetic field variations stem from residual variations of the current flow direction, resulting from local properties of the wire. These disorder potentials found near lithographically fabricated wires are two orders of magnitude smaller than those measured close to electroplated conductors.
Place, publisher, year, edition, pages
2005. Vol. 19, no 1, 56-65 p.
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-85488DOI: 10.1088/1742-6596/19/1/009ISI: 000233011800009OAI: oai:DiVA.org:kth-85488DiVA: diva2:499946
International Conference on Atoms and Molecules Near Surfaces Location: Int Wissenschaft Forum Ruprech-Karls Univ, Heidelberg, GERMANY, APR 04-08, 2005. QC 201203012012-02-132012-02-132012-03-01Bibliographically approved