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This research identifies a novel mechanism for achieving spin-selective transport in Rashba quantum wires by leveraging non-collinear spins, eliminating the need for phase decoherence typically required in such systems. By integrating additional pseudospin degrees of freedom like valley or orbital angular momentum, the study provides practical design principles to engineer coherent spin selectivity up to 10% across various nanowire architectures. These findings advance fundamental understanding and device engineering within quantum physics rather than addressing consumer AI applications or classical machine learning workflows.
Spin selectivity induced by non-collinear spins in Rashba wires
arXiv:2608.00599v1 Announce Type: cross Abstract: We report a previously overlooked general mechanism to obtain highly efficient spin selectivity in conventional time-reversal symmetric one-dimensional systems without invoking phase decoherence. We reveal that Rashba quantum wires featuring non-collinear spin states at the Fermi level inherently possess spin-selective transport properties. We show that this spin noncollinearity can be systematically designed and engineered by introducing an additional pseudospin degree of freedom - such as valley, sublattice, or orbital angular momentum - into spin-orbit coupled systems. By applying this framework to multi-subband semiconducting quantum wires and oxide nanowires, we establish a generalized route toward quantum-coherent spin selectivity up to 10 %. Our findings offer practical design principles for spin-selective transport devices.
Abstract:We report a previously overlooked general mechanism to obtain highly efficient spin selectivity in conventional time-reversal symmetric one-dimensional systems without invoking phase decoherence. We reveal that Rashba quantum wires featuring non-collinear spin states at the Fermi level inherently possess spin-selective transport properties. We show that this spin noncollinearity can be systematically designed and engineered by introducing an additional pseudospin degree of freedom - such as valley, sublattice, or orbital angular momentum - into spin-orbit coupled systems. By applying this framework to multi-subband semiconducting quantum wires and oxide nanowires, we establish a generalized route toward quantum-coherent spin selectivity up to 10 %. Our findings offer practical design principles for spin-selective transport devices.
Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Materials Science (cond-mat.mtrl-sci); Other Condensed Matter (cond-mat.other); Applied Physics (physics.app-ph); Quantum Physics (quant-ph)
arXiv:2608.00599 [cond-mat.mes-hall]
(or arXiv:2608.00599v1 [cond-mat.mes-hall] for this version)
https://doi.org/10.48550/arXiv.2608.00599 arXiv-issued DOI via DataCite (pending registration)
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