Macroscopic channel-size effect of nonequilibrium electron distributions in quantum hall conductors
Macroscopic channel-size effect of nonequilibrium electron distributions in quantum hall conductors
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DOI：
10.1103/physrevlett.95.166801
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发表时间：
2005-10-14
影响因子：
8.6
通讯作者：
Okamoto, T
中科院分区：
文献类型：
--
作者：
Kawano, Y;Okamoto, T
通过对不同尺寸霍尔条中回旋辐射的映射，研究了量子霍尔导体中激发到高朗道能级的非平衡电子的通道尺寸依赖性。获得的图像显示，非平衡电子与电流密度的空间演化显着依赖于霍尔酒吧的通道宽度在宏观尺度上的几百亩。这一观察提供了明确的证据，宏观通道尺寸效应，这可以合理地理解为源自一个很长的平衡长度的激发电子。
We have studied the channel-size dependence of nonequilibrium electrons excited into higher Landau levels in a quantum Hall conductor, by mapping cyclotron emission in Hall bars of different sizes. The images obtained reveal that the spatial evolution of the nonequilibrium electrons with current density significantly depends on the channel width of the Hall bar on a macroscopic scale of several hundred mu ms. This observation provides clear evidence of a macroscopic channel-size effect, which can be reasonably understood as originating from a very long equilibrium length of the excited electrons.