相干电子波的磁聚焦成像
Imaging Magnetic Focusing of Coherent Electron Waves
摘要：
电子的磁聚焦在电子输运的基础研究中已被证明是有用的。在这里，我们报告的直接成像磁聚焦的电子波，特别是在一个二维电子气（2DEG）。我们看到电子在二维电子气中沿边界反弹时的半圆形轨迹，以及显示电子波相干性质的条纹。开放系统中的流动成像可以通过冷却扫描探针显微镜来实现。实验和理论之间的显著一致表明我们有能力看到这些轨迹，并将该系统用作干涉仪。我们的形象分支电子流以及电子波的干涉。这种技术可以可视化开放系统中两点之间电子波的运动，为研究可能对量子信息处理和自旋电子学有用的系统提供了一种直接的方法。
英文摘要：
The magnetic focusing of electrons has proven its utility in fundamental studies of electron transport. Here we report the direct imaging of magnetic focusing of electron waves, specifically in a two-dimensional electron gas (2DEG). We see the semicircular trajectories of electrons as they bounce along a boundary in the 2DEG, as well as fringes showing the coherent nature of the electron waves. Imaging flow in open systems is made possible by a cooled scanning probe microscope. Remarkable agreement between experiment and theory demonstrates our ability to see these trajectories and to use this system as an interferometer. We image branched electron flow as well as the interference of electron waves. This technique can visualize the motion of electron waves between two points in an open system, providing a straightforward way to study systems that may be useful for quantum information processing and spintronics.
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