2007/06/30 by Bo Zhang, Carsten Henkel, C. Henkel · 1 citation
Mathematics · Physics and Astronomy · #Quantum and electron transport phenomena #Quantum many-body systems #Spectral Theory in Mathematical Physics #cond-mat.mtrl-sci #physics.atom-ph #physics.class-ph
paper · pdf · doi:10.1063/1.2800174
published as J. Appl. Phys. 102 (2007) 084907 · 10 pages, 9 figures, accepted for publication in J Appl Phys; figures plotted for slightly smaller structure
arxiv created 2007/09/10 · openalex publication_date 2007/10/15 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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.