Interference induced preparation of spinpolarized electrons in a three-terminal quantum ring
arXiv:quant-ph/0612183 · doi:10.1016/j.physe.2007.08.014
Abstract
We present an exact, analytic solution of the spin dependent quantum transport problem with spin-orbit interaction in a one-dimensional mesoscopic ring with one input and two output leads. We demonstrate that for appropriate parameters spatial interference in the ring leads to a behavior analogous to that of the Stern-Gerlach apparatus: different spin polarizations can be achieved in the two output channels from an originally totally unpolarized incoming spin state. It is shown that this requires an appropriate interference of states that carry oppositely directed currents. We find that spin polarization is possible for several geometries, including the case when the device is not symmetric with respect to the incoming lead. A clear connection is established between the Stern-Gerlach like property of the device and the relevant Aharonov-Casher phases in the loop geometry.
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- Fano resonances and electron spin transport through a two-dimensional spin-orbit-coupled quantum ring
- Spin current source based on a quantum point contact with local spin-orbit interaction
- Electron transfer through a multiterminal quantum ring: magnetic forces and elastic scattering effects
- Stable switch action based on quantum interference effect
- Simultaneous spin-based Boolean logic operations with re-programmable functionality
- Oscillating spin-orbit interaction as a source of spin-polarized wave packets in two-terminal nanoscale devices