Geometry-induced circulation of local photonic transport in a triangular metastructure

Abstract

A geometry-based mechanism for inducing circulation of photons is illustrated by a metastructure consisting of quantum dots arranged in a triangle coupled to photonic structures. The coupling between the photons and the excitons in the quantum dots leads to a photon blockade and limits the number of photons participating in the transport. In the steady state described by the quantum master equation of photons, the local photonic currents exhibit distinct circulation patterns, which originate from the wave nature in a multi-path geometry. The geometry-based mechanism does not require an artificial gauge field from light-matter interactions. The phase diagrams showing where different patterns of circulation can be found saturate as the number of photons allowed on each site increases. By using the third-quantization formalism, we show the circulation survives without any photon blockade in the noninteracting case. Moreover, we demonstrate the decoupling of the direction of the local current from the density difference and propose possible applications of the local photonic transport.

arXiv comment10 pages, 7 figures, submitted

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• Current circulation near additional energy degeneracy points in quadratic Fermionic networks
• Modified Quantum Wheatstone Bridge based on current circulation
• Third quantization with Hartree approximation for open-system bosonic transport