Tunable Fano Resonances in Transport through Microwave Billiards

TL;DR

This paper introduces a tunable microwave device that controls Fano resonance line shapes in quantum billiards, enabling detailed analysis of resonance interactions and coherence effects in transport.

Contribution

It presents a novel microwave scattering setup with adjustable Fano parameters, validated by quantum calculations, to study resonance interactions and decoherence in quantum transport.

Findings

Fano line shapes can be tuned via the device parameters.

Transport remains nearly fully coherent in the setup.

Resonance interactions influence the Fano line shape parameters.

Abstract

We present a tunable microwave scattering device that allows the controlled variation of Fano line shape parameters in transmission through quantum billiards. Transport in this device is nearly fully coherent. By comparison with quantum calculations, employing the modular recursive Green's-function method, the scattering wave function and the degree of residual decoherence can be determined. The parametric variation of Fano line shapes in terms of interacting resonances is analyzed.