Regensburg 2010 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 18: Focussed Session: Strong Light Matter Coupling I

HL 18.1: Invited Talk

Tuesday, March 23, 2010, 09:30–10:00, H13

Strong light-matter interaction in quantum dot micropillar cavities — •Stephan Reizenstein, Caroline Kistner, Steffen Münch, Christian Schneider, Micha Strauß, Philipp Franeck, Arash Rahimi-Iman, Tobias Heindel, Sven Höfling, Lukas Worschech, and Alfred Forchel — Technische Physik, Universität Würzburg, Würzburg, Germany

Following the first demonstration of strongly coupled quantum dot (QD)-microcavity systems enormous effort has been devoted to this field of cavity quantum electrodynamics (cQED). For applications and for fundamental cQED studies it is crucial to control the light-matter coupling strength by external parameters. To date most experimental studies involving strong coupling in QD-microcavity systems have relied on temperature tuning while electric and magnetic fields are required to fully explore their potential in terms of switching speed, local tuning and in-situ control of the interaction strength.

In this contribution, we will address recent progress in the field of strongly coupled QD-micropillar systems controlled by external parameters. For instance, it will be demonstrated that electrically contacted high-Q micropillars with large, high oscillator strength In_0.3Ga_0.7As QDs in the active layer allow for electro-optical resonance tuning in the strong coupling regime. Besides, we will show that external magnetic fields can induce a transition from the strong to the weak coupling regime and provide a means to access the spin degree of freedom in magneto-optical studies.