Long-Range Order in Electronic Transport through Disordered Metal Films

Details Long-Range Order in Electronic Transport through Disordered Metal Films Long-Range Order in Electronic Transport through Disordered Metal Films

2008-02-04

arxiv.org/abs/0802.0386v1

Science 319, 1226 - 1229, (2008)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1126/science.1152458

Ultracold atom magnetic field microscopy enables the probing of current flow patterns in planar structures with unprecedented sensitivity. In polycrystalline metal (gold) films we observe long-range correlations forming organized patterns oriented at +/- 45 deg relative to the mean current flow, even at room temperature and at length scales orders of magnitude larger than the diffusion length or the grain size. The preference to form patterns at these angles is a direct consequence of universal scattering properties at defects. The observed amplitude of the current direction fluctuations scales inversely to that expected from the relative thickness variations, the grain size and the defect concentration, all determined independently by standard methods. This indicates that ultracold atom magnetometry enables new insight into the interplay between disorder and transport.

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