金属微结构周围的磁噪声
Magnetic noise around metallic microstructures
摘要：
计算了有限温度下金属微结构附近的局部磁场谱。我们的主要重点是偏离一个平面分层的几何形状，我们审查的主要属性。任意几何形状的处理与基于表面积分方程的数值计算的帮助。磁噪声在具有有限横向宽度的扁平导线上方显示出显着的极化各向异性，与无限宽的导线形成鲜明对比。在一个二维的设置的限制，我们的研究结果提供了准确的估计损失和失相率在所谓的“原子芯片陷阱”的基础上的金属线。一个简单的近似的基础上不相干的本地电流元素的总和给出了定性的协议与数值，但未能描述相邻对象之间的电流相关性。
英文摘要：
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.
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