Resonant reflection at magnetic barriers in quantum wires

Details Resonant reflection at magnetic barriers in quantum wires Resonant reflection at magnetic barriers in quantum wires

2007-01-05

arxiv.org/abs/cond-mat/0701102v2

Phys. Rev. B 75, 205301 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 5 figures

Scientific paper

10.1103/PhysRevB.75.205301

The conductance of a quantum wire containing a single magnetic barrier is studied numerically by means of the recursive Greens function technique. For sufficiently strong and localized barriers, Fano - type reflection resonances are observed close to the pinch-off regime. They are attributed to a magnetoelectric vortex-type quasibound state inside the magnetic barrier that interferes with an extended mode outside. We furthermore show that disorder can substantially modify the residual conductance around the pinch-off regime.

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