Perfect spin filtering device through a Mach Zehnder interferometer in GaAs/AlGaAs electron gas

Abstract

Spin filtering through quantum spin interference is addressed exactly, in two dimensions, in a medium that has both Rashba and Dresselhaus spin-orbit couplings and an applied external magnetic field. The problem is addressed from the fully non-Abelian Gauge formulation. We propose an experimentally feasible electronic Mach Zehnder Interferometer and solve for the perfect spin filtering conditions. We find two broad solutions, one where filtering is achieved in the original incoming basis, that is purely a non-Abelian solution, and the other where one needs a tilted axis to observe the polarized output spinor. The latter solution is well approximated by an Abelianized approximation. Both solutions apply for arbitrary incoming polarization, and are only limited by the randomness of the incoming spinor state.

published version, one figure added

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Cited by in corpus (4)

• Filtering and analyzing mobile qubit information via Rashba-Dresselhaus-Aharonov-Bohm interferometers
• Mesoscopic rings with Spin-Orbit interactions
• Mach-Zehnder Interferometric device for spin filtering in a GaAs/AlGaAs electron gas
• Spin polarization via decoherence in spin-orbit active media coupled to an electron reservoir