Dresden 2006 – scientific programme

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HL: Halbleiterphysik

HL 50: Poster II

HL 50.89: Poster

Thursday, March 30, 2006, 16:30–19:00, P3

Single photon emission from CdSe/ZnSe quantum dots — •Christian Peitzmeyer, Steffen Michaelis deVasconcellos, Patrick Ester, Christof Arens, Dirk Mügge, Artur Zrenner, Detlef Schikora, and Klaus Lischka — Universität Paderborn, Department Physik, Warburger Strasse 100, D-33095 Paderborn

We have studied the correlation of the photon emission from a single selfassembled CdSe/ZnSe Stranski-Krastanow quantum dot under cw excitation from a blue-emitting laser diode. The quantum dot surface density was 10¹⁰ to 10¹¹ cm⁻². Spectra were taken on mesa structures at T = 4.2K, which contain only a small number of dots. The emission of the CdSe dots was measured by a micro-photoluminescence setup, using a LN₂-cooled CCD camera. In the single dot emission antibunching is observed. Therefore a single CdSe dot can be used for the generation of single photons on demand. Stranski-Krastanow-grown quantum dots as used within this work have advantages in comparison to other emitters in the green spectral range, because photobleaching, blinking and spectral diffusion do not occur.