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.

6 pages, 5 figures

References in corpus (2)

• Size-Dependence of the Wavefunction of Self-Assembled Quantum Dots
• Probing electric and magnetic vacuum fluctuations with quantum dots

Cited by in corpus (4)

• Strong coupling of quantum emitters and the exciton polariton in MoS${}_2$ nanodisks
• 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