Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 104: Quantum Dots and Wires: Optical Properties V (mainly Indiviual Photons)

HL 104.1: Vortrag

Freitag, 30. März 2012, 11:45–12:00, EW 201

Contactless carrier transport and photon anti-bunching emission in GaAs-based nanowires using surface acoustic waves — •Alberto Hernández-Mínguez¹, Michael Möller², Steffen Breuer¹, Carsten Pfüller¹, Claudio Somaschini¹, Snežana Lazić¹, Oliver Brandt¹, Alberto García-Cristóbal², Mauricio M. de Lima Jr.², Andrés Cantarero², Lutz Geelhaar¹, Henning Riechert¹, and Paulo V. Santos¹ — ¹Paul-Drude-Institut für Festkörperelektronik, Berlin, Germany — ²Materials Science Institute, University of Valencia, Valencia, Spain

The oscillating piezoelectric field of a surface acoustic wave (SAW) has proven to be very useful in capturing and transporting photogenerated charges as well as spin ensembles in 2-D semiconductor heterostructures. In this contribution we demonstrate that the piezoelectric potential generated by a SAW propagating on a LiNbO₃ substrate can transport photoexcited carriers in GaAs-based nanowires (NWs) deposited on it, leading to remote exciton recombination in the form of sub-ns light pulses synchronized with the SAW frequency. This contactless manipulation of carriers by SAWs opens interesting perspectives for NW applications in opto-electronic devices operating at GHz frequencies. As an example, we demonstrate a high-frequency source of anti-bunched photons based on the acoustic transport of electrons and holes photoexcited on one end of the NW and their recombination in quantum-dot-like centers created by the introduction of In at the opposite end.