Dissipation engineered directional filter for quantum ratchets

TL;DR

This paper introduces a method to achieve directional transport control in quantum ratchets using a dissipative impurity, combining theoretical analysis with experimental demonstration of one-way transmittance.

Contribution

The work presents a novel dissipation-based approach to engineer directional filtering in quantum ratchets, supported by Floquet theory and experimental validation.

Findings

Demonstrated one-way transmittance in plasmonic waveguides

Theoretically analyzed the impurity's filtering effect using Floquet-S-Matrix theory

Experimental observation of transport rectification in a dissipative quantum system

Abstract

We demonstrate transport rectification in a hermitian Hamiltonian quantum ratchet by a dissipative, dynamic impurity. While the bulk of the ratchet supports transport in both directions, the properly designed loss function of the local impurity acts as a direction-dependent filter for the moving states. We analyse this scheme theoretically by making use of Floquet-S-Matrix theory. In addition, we provide the direct experimental observation of one-way transmittance in periodically modulated plasmonic waveguide arrays containing a local impurity with engineered losses.