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Comment: 12 pages, 6 figures, to be published in Phys. Rev. B
This article discusses the spin-torque effect in a spin-valve made out of two
ferromagnetic leads connected through a coherent nanoconductor (NC), in the
limit where a single channel of the NC lies near the Fermi energy of the leads.
Due to quantum interferences inside the NC, the spin-torque presents clear
qualitative differences with respect to the case of a multichannel disordered
spin-valve. In particular, it can be modulated with the NC gate voltage. In
principle, this modulation can be observed experimentally, assuming that the
spin-torque affects a ferromagnetic nano-domain in direct contact with the NC.
Comment: To appear in Physical Review Letters
Comment: 12 pages, 5 figures
Comment: 7 pages, 6 figures, revised version
We theoretically propose a scheme for a spin quantum bit based on a double
quantum dot contacted to ferromagnetic elements. Interface exchange effects
enable an all electric manipulation of the spin and a switchable strong
coupling to a superconducting coplanar waveguide cavity. Our setup does not
rely on any specific band structure and can in principle be realized with many
different types of nanoconductors. This allows to envision on-chip single spin
manipulation and read-out using cavity QED techniques.
Comment: submitted to Phys. Rev. Lett
Comment: 9 pages, 6 figures, to appear in Phys. Rev. B
Comment: 5 pages, 3 figures, revised version, to appear in Phys. Rev. Lett
