Role of multilevel states on quantum-dot emission in photonic-crystal cavities

K. H. Madsen, T. B. Lehmann, and P. Lodahl
Phys. Rev. B 94, 235301 – Published 2 December 2016

Abstract

Semiconductor quantum dots embedded in photonic-crystal nanostructures have been the subject of intense study. In this context, quantum dots are often considered to be simple two-level emitters, i.e., the complexities arising from the internal fine structure are neglected. We show that due to the intricate spatial variations of the electric field polarization found in photonic crystal, the two orthogonal fine-structure states of quantum dots in general both couple significantly to a cavity mode, implying that the two-level description is not sufficient. As a consequence the emission dynamics and spectra, which are often recorded in experiments, are modified both in the weak- and strong-coupling regimes. The proposed effects are found to be significant for system parameters of current state-of-the-art photonic-crystal cavities.

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  • Received 12 February 2016
  • Revised 30 September 2016

DOI:https://doi.org/10.1103/PhysRevB.94.235301

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

K. H. Madsen, T. B. Lehmann, and P. Lodahl*

  • Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen, Denmark

  • *lodahl@nbi.ku.dk; www.quantum-photonics.dk

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Issue

Vol. 94, Iss. 23 — 15 December 2016

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