Department of Applied Physics and QPEC, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Phys Rev Lett. 2010 Jun 18;104(24):246801. doi: 10.1103/PhysRevLett.104.246801. Epub 2010 Jun 14.
The anisotropy of the spin-orbit interaction (SOI) is studied for a single uncapped InAs self-assembled quantum dot holding just a few electrons. The SOI energy is evaluated from anticrossing or SOI-induced hybridization between the ground and excited states with opposite spins. The magnetic angular dependence of the SOI energy falls on an absolute cosine function for azimuthal rotation, and a cosinelike function for tilting rotation. Furthermore, the SOI energy is quenched for a specific magnetic field vector. The angular dependence of SOI is found to compare well with calculation of Rashba SOI in a two-dimensional harmonic potential.
研究了单个未覆盖的含少数电子的 InAs 自组装量子点中自旋轨道相互作用（SOI）的各向异性。通过具有相反自旋的基态和激发态之间的反交叉或 SOI 诱导的杂化来评估 SOI 能量。SOI 能量的磁角依赖性对于方位旋转落在绝对余弦函数上，对于倾斜旋转落在余弦函数上。此外，SOI 能量对于特定的磁场矢量被猝灭。发现 SOI 的角依赖性与二维谐波势中 Rashba SOI 的计算很好地吻合。
