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Compensation of phonon-induced renormalization of vacuum Rabi splitting in large quantum dots : Towards temperature-stable strong coupling in the solid state with quantum dot-micropillars

Titelangaben

Hopfmann, C. ; Musiał, Anna ; Strauß, M. ; Barth, Andreas M. ; Glässl, Martin ; Vagov, Alexei ; Strauß, M. ; Schneider, C. ; Höfling, Sven ; Kamp, Martin ; Axt, Vollrath M. ; Reitzenstein, S.:
Compensation of phonon-induced renormalization of vacuum Rabi splitting in large quantum dots : Towards temperature-stable strong coupling in the solid state with quantum dot-micropillars.
In: Physical Review B. Bd. 92 (2015) Heft 24 . - Art.Nr. 245403, 10 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.92.245403

Angaben zu Projekten

Projektfinanzierung: Deutsche Forschungsgemeinschaft
Supported from the Polish Ministry of Science and Higher Education within the “Mobilnosic Plus” programme

Abstract

We study experimentally the influence of temperature on the emission characteristics of quantum dot-micropillars in the strong coupling regime of cavity quantum electrodynamics (cQED). In particular, we investigate its impact on the vacuum Rabi splitting (VRS) and we address the important question of the temperature stability of the coherent coupling regime in a semiconductor system, which is relevant in view of both fundamental study and future applications. To study the temperature dependence we investigate an unprecedentedly large number of strong coupling cases (89) in a wide temperature range from 10 up to 50 K, which constitutes a good basis for statistical analysis. The experiment indicates a statistically significant increase of the VRS with temperature in contrast to an expected decrease of the VRS due to the dephasing induced by acoustic phonons. From the theoretical point of view, the phonon-induced renormalization of the VRS is calculated using a real-time path-integral approach for strongly confined quantum dots (QDs), which allows for a numerical exact treatment of the coupling between the QD and a continuum of longitudinal acoustic phonons. The absence of the expected decrease of the VRS with temperature in our experimental data can be attributed to a unique optical property of laterally extended In0.4Ga0.6As QDs used in this study. Their electronic structure facilitates an effective temperature-driven increase of the oscillator strength of the excitonic state by up to 40 in the given temperature range. This leads to enhanced light-matter interaction and overcompensates the phonon-related decrease of the VRS. The observed persistence of strong coupling in the presence of phonon-induced decoherence demonstrates the appealing possibility to counteract detrimental phonon effects in the cQED regime via engineering the electronic structure of QDs.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: cavity; strong light-matter coupling; quantum dot; path-integrals; pure dephasing; phonons; decoherence; excitons; quantum dissipative dynamics; phonon induced relaxation; photon losses; phonon-induced renormalization of vacuum Rabi splitting; quantum dot-micropillars; temperature dependence; cavity QED
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III > Lehrstuhl Theoretische Physik III - Univ.-Prof. Dr. Martin Axt
Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Theoretische Physik III
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 02 Nov 2017 12:20
Letzte Änderung: 02 Nov 2017 12:41
URI: https://eref.uni-bayreuth.de/id/eprint/40275