Berlin 2005 – scientific programme

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HL: Halbleiterphysik

HL 20: Symposium: Single Photon Sources and Spectroscopy of Individual Quantum Systems

HL 20.4: Talk

Saturday, March 5, 2005, 12:15–12:45, TU P270

Spectroscopy of single nanowire heterostructures — •V. Zwiller, M. Borgström, and A. Imamoglu — Institute of Quantum Electronics, ETH, 8093 Zürich, Switzerland

Quantum dots are often referred to as artificial atoms because of their atom like density of states, yielding sharp optical transitions. Unlike for atoms, quantum dots properties can be tailored by modifying their composition, shape and size. Devices based on single quantum dots enable new functionalities; one particularly exciting novel function is the generation of non classical light.
We will present results obtained on single GaAsP quantum dots grown in GaP nanowires. The wires were grown using 20 nm sized gold catalysts by the use of metal organic vapor phase epitaxy in the vapor liquid solid growth mode. Low temperature photoluminescence studies were performed on single wires under continuous and pulsed laser excitation.
Previously we demonstrated single photon generation in several material systems: InAs quantum dots in GaAs were used to generate single photons at around 920 nm, InP quantum dots in GaInP at around 680 nm and CdSe dots in ZnSe were used for the green region. The potential of these novel quantum dots embedded in wires will be compared to the conventional Stranski Krastanow quantum dots.