Unraveling the mesoscopic character of quantum dots in nanophotonics

Abstract

We provide a microscopic theory for semiconductor quantum dots that explains the pronounced deviations from the prevalent point-dipole description that were recently observed in spectroscopic experiments on quantum dots in photonic nanostructures. At the microscopic level the deviations originate from structural inhomogeneities generating a large circular quantum current density that flows inside the quantum dot over mesoscopic length scales. The model is supported by the experimental data, where a strong variation of the multipolar moments across the emission spectrum of quantum dots is observed. Our work enriches the physical understanding of quantum dots and is of significance for the fields of nanophotonics, quantum photonics, and quantum-information science, where quantum dots are actively employed.

arXiv comment6 pages, 5 figures

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Cited by in corpus (11)

• Chirality of nanophotonic waveguide with embedded quantum emitter for unidirectional spin transfer
• Phonon Decoherence of Quantum Dots in Photonic Structures: Broadening of the Zero-Phonon Line and the Role of Dimensionality
• Numerical optimization of the extraction efficiency of a quantum-dot based single-photon emitter into a single-mode fiber
• Theory and experiments of coherent photon coupling in semiconductor nanowire waveguides with quantum dot molecules
• Resonance fluorescence beyond the dipole approximation of a quantum dot in a plasmonic nanostructure
• Emission redistribution from a quantum dot-bowtie nanoantenna
• Strong coupling of quantum emitters and the exciton polariton in MoS${}_2$ nanodisks
• Time-frequency encoded single-photon sources and broadband quantum memories based on a tunable one-dimensional atom
• Waveguide Excitation and Spin Pumping of Chirally Coupled Quantum Dots
• Network structure and dynamics of effective models of non-equilibrium quantum transport
• A Multipoint Method for Approximation of Wavefunctions at a Mesoscopic Scale