Magnetic noise around metallic microstructures
- We compute the local spectrum of the magnetic field near a metallic microstructure at finite temperature. Our main focus is on deviations from a plane-layered geometry for which we review the main properties. Arbitrary geometries are handled with the help of numerical calculations based on surface integral equations. The magnetic noise shows a significant polarization anisotropy above flat wires with finite lateral width, in stark contrast to an infinitely wide wire. Within the limits of a two-dimensional setting, our results provide accurate estimates for loss and dephasing rates in so-called `atom chip traps' based on metallic wires. A simple approximation based on the incoherent summation of local current elements gives qualitative agreement with the numerics, but fails to describe current correlations among neighboring objects.
Author details: | Bo Zhang, Carsten HenkelORCiDGND |
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URL: | http://dx.doi.org/10.1063/1.2800174 |
DOI: | https://doi.org/10.1063/1.2800174 |
ISSN: | 0021-8979 |
Publication type: | Article |
Language: | English |
Year of first publication: | 2007 |
Publication year: | 2007 |
Release date: | 2017/03/25 |
Source: | Journal of Applied Physics. - ISSN 0021-8979. - 102 (2007), 8, Artn. 084907 - 084910 |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |