Spatially resolved monitoring of the evolution of the breakdown of the quantum Hall effect: Direct observation of inter-Landau-level tunneling
Spatially resolved monitoring of the evolution of the breakdown of the quantum Hall effect: Direct observation of inter-Landau-level tunneling
复制标题
量子霍尔效应击穿演化的空间分辨监测：朗道能级间隧道效应的直接观察
DOI：
10.1209/epl/i1999-00563-6
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发表时间：
1999
期刊：
影响因子：
1.8
通讯作者：
K. Eberl
中科院分区：
文献类型：
--
作者：
I. Kaya;G. Nachtwei;K. Klitzing;K. Eberl
我们测量了量子霍尔效应沿着宏观收缩的GaAs/AlGaAs 2DEG异质结的击穿演化。从耗散电阻率沿着漂移方向的演变，我们得出结论，电子被激发到上朗道能级以恒定的速率，这指数依赖于霍尔电压。根据杂质介导的电子在朗道能级之间的隧穿解释了上述结果。
We have measured the evolution of breakdown of the quantum Hall effect along a macroscopic constriction on a GaAs/AlGaAs 2DEG heterostructure. From the evolution of the dissipative resistivity along the drift direction, we conclude that electrons are excited to the upper Landau level at a constant rate which exponentially depends on the Hall voltage. The results are explained on the basis of impurity mediated tunneling of electrons between the Landau levels.