Measuring the effective phonon density of states of a quantum dot in cavity quantum electrodynamics

Kristian Høeg Madsen, Per Kær Nielsen, Asger Kreiner-Møller, Søren Stobbe, Anders Nysteen, Jesper Mørk, Peter Lodahl

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Abstract

We employ detuning-dependent decay-rate measurements of a quantum dot in a photonic-crystal cavity to study the influence of phonon dephasing in a solid-state quantum-electrodynamics experiment. The experimental data agree with a microscopic non-Markovian model accounting for dephasing from longitudinal acoustic phonons, and the analysis explains the difference between nonresonant cavity feeding in different nanocavities. From the comparison between experiment and theory we extract the effective phonon density of states experienced by the quantum dot in the nanocavity. This quantity determines all phonon dephasing properties of the system and is found to be described well by a theory of bulk phonons.
Original languageEnglish
Article number045316
JournalPhysical Review B Condensed Matter
Volume88
Issue number4
Number of pages5
ISSN0163-1829
DOIs
Publication statusPublished - 2013

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