Spin filtering in a Rashba-Dresselhaus-Aharonov-Bohm double-dot interferometer

Abstract

We study the spin-dependent transport of spin-1/2 electrons through an interferometer made of two elongated quantum dots or quantum nanowires, which are subject to both an Aharonov-Bohm flux and (Rashba and Dresselhaus) spin-orbit interactions. Similar to the diamond interferometer proposed in our previous papers [Phys. Rev. B {\bf 84}, 035323 (2011); Phys. Rev. B {\bf 87}, 205438 (2013)], we show that the double-dot interferometer can serve as a perfect spin filter due to a spin interference effect. By appropriately tuning the external electric and magnetic fields which determine the Aharonov-Casher and Aharonov-Bohm phases, and with some relations between the various hopping amplitudes and site energies, the interferometer blocks electrons with a specific spin polarization, independent of their energy. The blocked polarization and the polarization of the outgoing electrons is controlled solely by the external electric and magnetic fields and do not depend on the energy of the electrons. Furthermore, the spin filtering conditions become simpler in the linear-response regime, in which the electrons have a fixed energy. Unlike the diamond interferometer, spin filtering in the double-dot interferometer does not require high symmetry between the hopping amplitudes and site energies of the two branches of the interferometer and thus may be more appealing from an experimental point of view.

15 pages, 3 figures

References in corpus (6)

• Direct Measurement of the Spin-Orbit Interaction in a Two-Electron InAs Nanowire Quantum Dot
• Strong tuning of Rashba spin orbit interaction in single InAs nanowires
• Electrical control of a solid-state flying qubit
• Non-Abelian gauge field theory of the spin-orbit interaction and a perfect spin filter
• Zero-conductance resonances and spin-filtering effects in ring conductors subject to Rashba coupling
• Robustness of spin filtering against current leakage in a Rashba-Dresselhaus-Aharonov-Bohm interferometer

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• Spin filtering in all-electrical three-terminal interferometers
• Simple spin-orbit based devices for electron spin polarization
• Reconfigurable quantum logic gates using Rashba controlled spin polarized currents
• Spin-orbit interactions, time-reversal symmetry, and spin selection
• Spin-polarized localization in a magnetized chain
• Optical and spin-optical superpositions modulated by Aharonov-Bohm effect
• Aharonov Bohm Effect in Voltage Dependent Molecular Spin Dimer Switch