Komori Yosuke, Sakuma Satoru, Okamoto Tohru
Department of Physics, University of Tokyo, 7-3-1 Hongo, Tokyo, Japan.
Phys Rev Lett. 2007 Oct 5;99(14):146807. doi: 10.1103/PhysRevLett.99.146807.
A spin current perpendicular to the electric current is investigated around a Landau level filling factor nu=3 in a GaAs/AlGaAs two-dimensional electron system. Measurements of dynamic nuclear polarization in the vicinity of the edge of a specially designed Hall bar sample indicate that the direction of the spin current with respect to the Hall electric field reverses its polarity at nu=3, where the dissipative current carried by holes in the spin up Landau level is replaced with that by electrons in the spin down Landau level.
在 GaAs/AlGaAs 二维电子系统中，围绕朗道能级填充因子 ν = 3 研究了与电流垂直的自旋电流。对一个专门设计的霍尔条形样品边缘附近的动态核极化进行测量，结果表明，自旋电流相对于霍尔电场的方向在 ν = 3 时反转其极性，此时自旋向上朗道能级中的空穴携带的耗散电流被自旋向下朗道能级中的电子携带的电流所取代。
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