Fano resonances and electron spin transport through a two-dimensional spin-orbit-coupled quantum ring

Abstract

Electron transport through a spin-orbit-coupled quantum ring is investigated within linear response theory. We show that the finite width of the ring results in the appearance of Fano resonances in the conductance. This turns out to be a consequence of the spin-orbit interaction that leads to a breaking of the parity of the states localized in the ring. The resonances appear when the system is close to maxima of Aharonov-Casher conductance oscillations where spin transfer is heavily modified. When the spin-orbit coupling strength is detuned from the Aharonov-Casher maxima the resonances are broadened resulting in a dependence of the spin transport on the electron Fermi energy in contrast to predictions from one-dimensional models

References in corpus (12)

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• Spin-orbit qubit in a semiconductor nanowire
• Measurement of Rashba and Dresselhaus spin-orbit magnetic fields
• Quantum rings as electron spin beam splitters
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• Spin rotations induced by electron running on closed trajectories in gated semiconductor nanodevices
• Aharonov-Casher effect in Bi${}_2$Se${}_3$ square-ring interferometers
• Two-dimensional imaging of the spin-orbit effective magnetic field
• Interference induced preparation of spinpolarized electrons in a three-terminal quantum ring
• Filtering of spin currents based on ballistic ring
• Two-dimensional electron scattering in regions of nonuniform spin-orbit coupling
• Magnetic forces and localized resonances in electron transfer through quantum rings

Cited by in corpus (7)

• Spin current source based on a quantum point contact with local spin-orbit interaction
• Fano resonances in hexagonal zigzag graphene rings under external magnetic flux
• Collapse of the Fano Resonance Caused by the Nonlocality of the Majorana State
• Topological insulator ring with magnetic impurities
• Valley-resolved Fano resonance in monolayer transition metal dichalcogenides nanoribbons with attached stubs
• Lamb Shift of Energy Levels in Quantum Rings
• Localized states in a semiconductor quantum ring with a tangent wire