Probing different regimes of strong field light-matter interaction with semiconductor quantum dots and few cavity photons

F. Hargart, K. Roy-Choudhury, T. John, S. L. Portalupi, C. Schneider, Sven Höfling, M. Kamp, S. Hughes, P. Michler

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Abstract

In this work we present an extensive experimental and theoretical investigation of different regimes of strong field light-matter interaction for cavity-driven
quantum dot-cavity systems. The electric field enhancement inside a high-Q micropillar cavity facilitates exceptionally strong interaction with few cavity
photons, enabling the simultaneous investigation for a wide range of QD-laser
detuning. In case of a resonant drive, the formation of dressed states and a
Mollow triplet sideband splitting of up to 45 μeV is measured for a mean cavity
photon number ⟨nc⟩ ≤ 1. In the asymptotic limit of the linear AC Stark effect
we systematically investigate the power and detuning dependence of more than
400 QDs. Some QD-cavity systems exhibit an unexpected anomalous Stark shift,
which can be explained by an extended dressed 4-level QD model. We provide a
detailed analysis of the QD-cavity systems properties enabling this novel effect.
The experimental results are successfully reproduced using a polaron master
equation approach for the QD-cavity system, which includes the driving laser
field, exciton-cavity and exciton-phonon interactions.
Original languageEnglish
Article number123031
Number of pages13
JournalNew Journal of Physics
Volume18
DOIs
Publication statusPublished - 23 Dec 2016

Keywords

  • Quantum dots
  • Light-matter interaction
  • AC Stark effect
  • Dressed states

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