Controlling the Biexciton-Exciton Cascade Kinetics in a Quantum Dot via Coupling to a Microcavity Optical Mode

G. Sęk a, D.N. Krizhanovskii b, V.D. Kulakovskii c, S. Reitzenstein d and M. Kamp e aLaboratory for Optical Spectroscopy of Nanostructures, Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland bDepartment of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, United Kingdom cInstitute of Solid State Physics, Russian Academy of Sciences, Chernogolovka 142432, Russia dInstitute of Solid State Physics, Berlin University of Technology, Berlin 10623, Germany eTechnische Physik, University of Würzburg and Wilhelm-Conrad-Röntgen-Research Center, for Complex Material Systems, Am Hubland, Würzburg 97074, Germany

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The luminescence of single and two exciton states in a quantum dot embedded in the active layer of a micropillar cavity has been investigated. Temperature tuning has been used to bring the energy states of the quantum dot and the cavity into resonance. Studying the resonance behavior of the exciton and biexciton transitions with cavity mode revealed a similar Purcell effect for both lines. The cavity-induced changes of the respective radiative lifetimes have been shown to allow for controlling the ratio between the single and two exciton occupation and their relative emission rates in a single quantum dot.

DOI: 10.12693/APhysPolA.129.A-44 PACS numbers: 78.67.Hc, 71.35.-y, 78.55.-m, 42.50.Pq