Grbić Boris, Leturcq Renaud, Ihn Thomas, Ensslin Klaus, Reuter Dirk, Wieck Andreas D
Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland.
Phys Rev Lett. 2007 Oct 26;99(17):176803. doi: 10.1103/PhysRevLett.99.176803. Epub 2007 Oct 24.
We have measured highly visible Aharonov-Bohm (AB) oscillations in a ring structure defined by local anodic oxidation on a p-type GaAs heterostructure with strong spin-orbit interactions. Clear beating patterns observed in the raw data can be interpreted in terms of a spin geometric phase. Besides h/e oscillations, we resolve the contributions from the second harmonic of AB oscillations and also find a beating in these h/2e oscillations. A resistance minimum at B=0 T, present in all gate configurations, is the signature of destructive interference of the spins propagating along time-reversed paths.
我们在具有强自旋轨道相互作用的p型砷化镓异质结构上，通过局部阳极氧化定义的环形结构中测量到了高度可见的阿哈罗诺夫-玻姆（AB）振荡。在原始数据中观察到的清晰拍频模式可以用自旋几何相位来解释。除了h/e振荡外，我们还分辨出了AB振荡二次谐波的贡献，并且在这些h/2e振荡中也发现了拍频。在所有栅极配置中都存在的B = 0 T时的电阻最小值，是沿时间反演路径传播的自旋发生相消干涉的特征。
