Writing Spin in a Quantum Dot with Ferromagnetic and Superconducting Electrodes

Details Writing Spin in a Quantum Dot with Ferromagnetic and Superconducting Electrodes Writing Spin in a Quantum Dot with Ferromagnetic and Superconducting Electrodes

2003-01-14

arxiv.org/abs/cond-mat/0301213v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 3 figures

Scientific paper

10.1103/PhysRevB.69.121302

We propose an efficient mechanism for the operation of writing spin in a quantum dot, which is an ideal candidate for qubit. The idea is based on the Andreev reflection induced spin polarization (ARISP) in a ferromagnetic / quantum-dot / superconductor system. We find that on the resonance of Andreev reflection, the spin polarization of quantum dot strongly denpends on the magnetization of ferromagnetic electrode, and the sign of the spin polarization is controllable by bias voltage. In the presence of intradot Coulomb interaction, we show that ARISP effect can still survive as long as the charging energy is comparable to the superconducting gap. Detailed conditions and properties of ARISP are also discussed.

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