Bias-controllable intrinsic spin polarization in a quantum dot

Details Bias-controllable intrinsic spin polarization in a quantum dot Bias-controllable intrinsic spin polarization in a quantum dot

2005-10-07

arxiv.org/abs/cond-mat/0510162v1

Phys. Rev. B. 73, 235301 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 5 figures

Scientific paper

10.1103/PhysRevB.73.235301

We propose a novel scheme to efficiently polarize and manipulate the electron spin in a quantum dot. This scheme is based on the spin-orbit interaction and it possesses following advantages: (1) The direction and the strength of the spin polarization is well controllable and manipulatable by simply varying the bias or the gate voltage. (2) The spin polarization is quite large even with a weak spin-orbit interaction. (3) Both electron-electron interaction and multi-energy levels do not weaken but strengthen the spin polarization. (4) It has the short spin flip time. (5) The device is free of a magnetic field or a ferromagnetic material. (6) It can be easily realized with present technology.

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