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Related Experiment Video

Updated: Jun 4, 2026

Fabrication and Characterization of Superconducting Resonators

Fabrication and Characterization of Superconducting Resonators

Published on: May 21, 2016

Interference of Fano-Rashba conductance dips.

M M Gelabert¹, A Renart, L Serra

¹Departament de Física, Universitat de les Illes Balears, Palma de Mallorca, Spain.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|March 2, 2011

Summary

Interference in quantum wires with two Rashba regions shows distinct transmission behaviors. Depending on separation, Fano-Rashba dips cross or anti-cross, revealing Fabry-Perot oscillations or enhanced transmission from evanescent modes.

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Area of Science:

Condensed matter physics
Quantum mechanics
Mesoscopic physics

Background:

Quantum wires support single propagating modes.
Tunable Rashba spin-orbit interaction influences electron transport.
Interference phenomena are crucial in nanoscale devices.

Purpose of the Study:

Investigate the interference effects of two tunable Rashba regions in a quantum wire.
Analyze how the distance between regions affects transmission properties.
Explore the role of evanescent modes at short separations.

Main Methods:

Utilized scattering matrix theory for analytical expressions.
Modeled a quantum wire with one propagating mode.
Simulated interference patterns based on region separation.

Main Results:

Observed transmission dips (Fano-Rashba dips) that either cross or anti-cross.
Identified Fabry-Perot oscillations at large separations due to mode interference.
Found enhanced transmission and destruction of conductance dips at small separations due to overlapping evanescent modes.

Conclusions:

The spatial separation of tunable Rashba regions dictates interference outcomes.
Evanescent mode overlap significantly alters quantum transport at short distances.
Understanding these interference effects is vital for designing quantum devices.