Interference of Fano-Rashba conductance dips
A. Renart, M. M. Gelabert, L. Serra
TL;DR
This paper investigates how two tunable Rashba regions in a quantum wire interfere, affecting conductance dips, with implications for device design, highlighting the roles of separation distance and mode overlap.
Contribution
It provides analytical expressions for Fano-Rashba dip interference in quantum wires and discusses the impact of separation and mode overlap on conductance.
Findings
Conductance dips cross or anti-cross depending on region separation.
Large separations produce Fabry-Pérot oscillations.
Overlapping evanescent modes at small separations enhance transmission.
Abstract
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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