二维电子气中空间探测的电子-电子散射
Spatially probed electron-electron scattering in a two-dimensional electron gas
摘要：
使用扫描门显微镜（SGM），我们探测电子束和二维电子气（2DEG）之间的散射作为一个函数的光束的注入能量，和距离的注入点。在低注入能量，我们发现电子束散射的小角度，如先前所观察到的。在高注入能量下，我们发现了一个令人惊讶的结果：将SGM尖端放置在它反向散射电子的地方，增加了通过系统的微分电导。这种效果是由一个非平衡分布的电子在局部区域的2DEG附近的注入点。我们的数据表明，这种高度非平衡分布的空间范围是在注射点的1微米内。我们近似的非平衡区域具有一个有效的温度，线性依赖于注入能量。
英文摘要：
Using scanning gate microscopy (SGM), we probe the scattering between a beam of electrons and a two-dimensional electron gas (2DEG) as a function of the beam's injection energy, and distance from the injection point. At low injection energies, we find electrons in the beam scatter by small-angles, as has been previously observed. At high injection energies, we find a surprising result: placing the SGM tip where it back-scatters electrons increases the differential conductance through the system. This effect is explained by a non-equilibrium distribution of electrons in a localized region of 2DEG near the injection point. Our data indicate that the spatial extent of this highly non-equilibrium distribution is within ~1 micrometer of the injection point. We approximate the non-equilibrium region as having an effective temperature that depends linearly upon injection energy.
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