Long-range order in electronic transport through disordered metal films

被引:68
作者
Aigner, S. [1 ,2 ]
Della Pietra, L. [1 ]
Japha, Y. [3 ]
Entin-Wohlman, O. [3 ]
David, T. [3 ]
Salem, R. [3 ]
Folman, R. [3 ]
Schmiedmayer, J. [1 ,2 ]
机构
[1] Heidelberg Univ, Inst Phys, D-69120 Heidelberg, Germany
[2] Vienna Univ Technol, Osterreich Univ, Atominst, A-1020 Vienna, Austria
[3] Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel
基金
奥地利科学基金会;
关键词
D O I
10.1126/science.1152458
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Ultracold atom magnetic field microscopy enables the probing of current flow patterns in planar structures with unprecedented sensitivity. In polycrystalline metal ( gold) films, we observed long- range correlations forming organized patterns oriented at +/- 45 degrees relative to the mean current flow, even at room temperature and at length scales larger than the diffusion length or the grain size by several orders of magnitude. 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. Ultracold atom magnetometry thus enables new insight into the interplay between disorder and transport.
引用
收藏
页码:1226 / 1229
页数:4
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