Interference of Fano-Rashba conductance dips

Details Interference of Fano-Rashba conductance dips Interference of Fano-Rashba conductance dips

2011-02-02

arxiv.org/abs/1102.0457v1

J. Phys.: Condens. Matter 23, 115301 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 4 embedded figures

Scientific paper

10.1088/0953-8984/23/11/115301

We study the interference of two tunable Rashba regions in a quantum wire with one propagating mode. The transmission dips (Fano-Rashba dips) of the two regions either cross or anti cross depending on the distance between the two regions. For large separations we find Fabry-P\'erot oscillations due to the interference of forwards and backwards propagating modes. At small separations overlapping evanescent modes play a prominent role, leading to an enhanced transmission and destroying the conductance dip. Analytical expressions in scattering-matrix theory are given and the relevance of the interference effect in a device is discussed.

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