散粒噪声作为探测自旋极化单原子输运的手段。

Shot noise as a probe of spin-polarized transport through single atoms.

作者信息

Burtzlaff Andreas, Weismann Alexander, Brandbyge Mads, Berndt Richard

机构信息

Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany.

DTU Nanotech Department of Micro and Nanotechnology, NanoDTU, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.

出版信息

Phys Rev Lett. 2015 Jan 9;114(1):016602. doi: 10.1103/PhysRevLett.114.016602. Epub 2015 Jan 6.

DOI:10.1103/PhysRevLett.114.016602

PMID:25615489

Abstract

Single atoms on Au(111) surfaces have been contacted with the Au tip of a low temperature scanning tunneling microscope. The shot noise of the current through these contacts has been measured up to frequencies of 120 kHz and Fano factors have been determined to characterize the transport channels. The noise at Fe and Co atoms, the latter displaying a Kondo effect, indicates spin-polarized transport through a single channel. Transport calculations reproduce this observation.

摘要

金（111）表面上的单个原子已与低温扫描隧道显微镜的金探针接触。已测量通过这些接触的电流的散粒噪声，频率高达120kHz，并确定了法诺因子以表征传输通道。铁和钴原子处的噪声，后者表现出近藤效应，表明通过单个通道的自旋极化传输。输运计算再现了这一观察结果。