Tuning of the spin-orbit interaction in a quantum dot by an in-plane magnetic field

Article

关键词: WELLS;   

DOI  :  10.1103/PhysRevB.83.245324

来源: SCIE

【 摘 要 】

Using an exact-diagonalization approach we show that one-and two-electron InAs quantum dots exhibit an avoided crossing in the energy spectra that is induced by the spin-orbit coupling in the presence of an in-plane external magnetic field. The width of the avoided crossings depends strongly on the orientation of the magnetic field, which reveals the intrinsic anisotropy of the spin-orbit-coupling interactions. We find that for specific orientations of the magnetic field avoided crossings vanish. A value of this orientation can be used to extract the ratio of the strength of Rashba and Dresselhaus interactions. The spin-orbit anisotropy effects for various geometries and orientations of the confinement potential are discussed. Our analysis explains the physics behind the recent measurements performed on a gated self-assembled quantum dot [S. Takahashi et al., Phys. Rev. Lett. 104, 246801 (2010)].

【 授权许可】

Free