Electron transfer through a multiterminal quantum ring: magnetic forces and elastic scattering effects

Abstract

We study electron transport through a semiconductor quantum ring with one input and two output terminals for an elastic scatterer present within one of the arms of the ring. We demonstrate that the scatterer not only introduces asymmetry in the transport probability to the two output leads but also reduces the visibility of the Aharonov-Bohm conductance oscillations. This reduction occurs in spite of the phase coherence of the elastic scattering and is due to interruption of the electron circulation around the ring by the potential defect. The results are in a qualitative agreement with a recent experiment by Strambini et al. [Phys. Rev. B {\bf 79}, 195443 (2009)]. We also indicate that the magnetic symmetry of the sum of conductance of both the output leads as obtained in the experiment can be understood as resulting from the invariance of backscattering to the input lead with respect to the magnetic field orientation.

submitted to PRB

References in corpus (7)

• Quantum rings as electron spin beam splitters
• Networks of quantum nanorings: programmable spintronic devices
• Imaging Electron Wave Functions Inside Open Quantum Rings
• Direct measurement of the phase coherence length in a GaAs/GaAlAs square network
• Interference induced preparation of spinpolarized electrons in a three-terminal quantum ring
• Impact of classical forces and decoherence in multi-terminal Aharonov-Bohm networks
• Magnetic-field asymmetry of electron wave packet transmission in bent channels capacitively coupled to a metal gate

Cited by in corpus (5)

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• Aharonov-Bohm oscillations of four-probe resistance in topological quantum rings in silicene and bilayer graphene
• Magnetic forces and stationary electron flow in three-terminal semiconductor quantum ring