Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-09-21
Phys. Rev. B 80, 155334 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
submitted to PRB
Scientific paper
10.1103/PhysRevB.80.155334
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.
Poniedzialek M. R.
Szafran B.
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