title: Interference of Fano-Rashba conductance dips.
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-Perot 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.
authors.affiliation: Departament de Física, Universitat de les Illes Balears, Palma de Mallorca, Spain.
authors.forename: M M
authors.initials: MM
authors.lastname: Gelabert
authors.forename: A
authors.initials: A
authors.lastname: Renart
authors.forename: L
authors.initials: L
authors.lastname: Serra