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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

Title data

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. Vol. 92 (2015) Issue 24 . - Art.Nr. 245403, 10 S..
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.92.245403

Project information

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

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
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
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III > Chair Theoretical Physics III - Univ.-Prof. Dr. Martin Axt
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics III
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 02 Nov 2017 12:20
Last Modified: 02 Nov 2017 12:41
URI: https://eref.uni-bayreuth.de/id/eprint/40275