All-electrical injection and detection of a spin polarized current using 1D conductors

Abstract

All-electrical control of spin transport in nanostructures has been the central interest and chal- lenge of spin physics and spintronics. Here we demonstrate on-chip spin polarizing/filtering actions by driving the gate-defined one dimensional (1D) conductor, one of the simplest geometries for integrated quantum devices, away from the conventional Ohmic regime. Direct measurement of the spin polarization of the emitted current was performed when the momentum degeneracy was lifted, wherein both the 1D polarizer for spin injection and the analyzer for spin detection were demonstrated. The results showed that a configuration of gates and applied voltages can give rise to a tunable spin polarization, which has implications for the development of spintronic devices and future quantum information processing.

5 pages, 3 figures

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• A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
• What lurks below the last plateau: Experimental studies of the 0.7 x 2e^2/h conductance anomaly in one-dimensional systems
• Ballistic Spin Resonance
• Direct observation of non-equilibrium spin population in quasi-one-dimensional nanostructures

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• Slip electron flow in GaAs microscale constrictions
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• Surveying the Multicomponent Scattering Matrix: Unitarity and Symmetries
• On-chip quantum sensing of Kondo spins in a high-mobility quasi-one-dimensional nanoconstriction