Regensburg 2010 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 37: Quantum Dots and Wires: Optical Properties III

HL 37.3: Vortrag

Mittwoch, 24. März 2010, 10:00–10:15, H15

Remote pumping of self-assembled InGaAs Quantum Posts — •F. Knall¹, S. Völk¹, F. J. R. Schülein¹, H. Kim², T. A. Truong³, J. He³, P. M. Petroff³, A. Wixforth¹, and H. J. Krenner¹ — ¹Lehrstuhl für Experimentalphysik I, Universität Augsburg, 86159 Augsburg, Germany — ²Physics Department, UC Santa Barbara, Santa Barbara CA 93106, United States — ³Materials Department, UC Santa Barbara, Santa Barbara CA 93106, United States

Oscillating electric fields in piezoelectric semiconductors such as GaAs can be induced by using surface acoustic waves (SAW). These fields modulate the band edges of a quantum well (QW) and thus, spatially separate excitons into electrons and holes, which propagate along the SAW direction. Therefore, recombination will be suppressed and the photogenerated charge carriers are transported to a quantum post (QP) located away from the point of excitation. The carriers relax into the confined states of the QP where they radiatively recombine. Using a spatially resolved detection we demonstrate remote pumping of individual QPs by the SAW. QPs are ideal candidates for acoustic charge conveyance driven single photon generation since they combine the superior optical quality of conventional self-assembled quantum dots and direct lateral embedding within a wide quantum well.