Unraveling the Mesoscopic Character of Quantum Dots in Nanophotonics

Petru Tighineanu; Anders Søndberg Sørensen; Søren Stobbe; Peter Lodahl

doi:10.1103/PhysRevLett.114.247401

Unraveling the Mesoscopic Character of Quantum Dots in Nanophotonics

Petru Tighineanu, Anders Søndberg Sørensen, Søren Stobbe, Peter Lodahl

14 Citationer (Scopus)

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. 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.

Originalsprog	Engelsk
Artikelnummer	247401
Tidsskrift	Physical Review Letters
Vol/bind	114
Udgave nummer	24
ISSN	0031-9007
DOI	https://doi.org/10.1103/PhysRevLett.114.247401
Status	Udgivet - 19 jun. 2015

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10.1103/PhysRevLett.114.247401

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AU - Tighineanu, Petru

AU - Sørensen, Anders Søndberg

AU - Stobbe, Søren

AU - Lodahl, Peter

PY - 2015/6/19

Y1 - 2015/6/19

N2 - 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. 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.

AB - 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. 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.

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Unraveling the Mesoscopic Character of Quantum Dots in Nanophotonics

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