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We propose a novel scheme to efficiently polarize and manipulate the electronspin in a quantum dot. This scheme is based on the spin-orbit interaction andit possesses following advantages: (1) The direction and the strength of thespin polarization is well controllable and manipulatable by simply varying thebias or the gate voltage. (2) The spin polarization is quite large even with aweak spin-orbit interaction. (3) Both electron-electron interaction andmulti-energy levels do not weaken but strengthen the spin polarization. (4) Ithas the short spin flip time. (5) The device is free of a magnetic field or aferromagnetic material. (6) It can be easily realized with present technology.Comment: 9 pages, 5 figure

Bias-controllable intrinsic spin polarization in a quantum dot: Proposed scheme based on spin-orbit interaction