Imaging coherent electron flow in a two-dimensional electron gas

被引：1
|
作者：
Westervelt, RM [1 ]
Topinka, MA
LeRoy, BJ
Bleszynski, AC
Shaw, SEJ
Heller, EJ
Maranowski, KD
Gossard, AC
机构：
[1] Harvard Univ, Dept Phys, Div Engn & Appl Sci, Cambridge, MA 02138 USA
[2] Harvard Univ, Dept Chem & Chem Biol, Cambridge, MA 02138 USA
[3] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA
来源：
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2003年 / 18卷 / 1-3期
关键词：
scanning probe microscopy; two-dimensional electron gas; image electron flow;
D O I：
10.1016/S1386-9477(02)01050-0
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Images of coherent electron flow through a two-dimensional electron gas in a GaAs/AlGaAs heterostructure from a quantum point contact (QPC) were obtained at liquid He temperatures by using a scanning probe microscope with a charged tip that backscatters electrons. Near the QPC, at distances less than 500 nm, the images show angular lobes of electron flow in patterns determined by the quantum modes of the QPC. At greater distances, narrow branches of electron flow are observed, formed by the cumulative effects of small-angle scattering. In addition, the images show fringes spaced by half the Fermi wavelength, evidence that the electron flow is coherent. These observations agree well with theoretical simulations of electron flow. (C) 2003 Published by Elsevier Science B.V.
引用
收藏
页码：138 / 140
页数：3
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