Dresden 2011 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 71: Quantum Dots: Optical Properties

HL 71.1: Talk

Thursday, March 17, 2011, 10:15–10:30, POT 251

Simultaneous control of single self-assembled quantum dots by strain and electric fields — •Rinaldo Trotta, Paola Atkinson, Johannes D. Plumhof, Santosh Kumar, Roman Rezaev, Eugenio Zallo, Andreas Herklotz, Kathrin Dörr, Armando Rastelli, and Oliver G. Schmidt — Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany

The possibility to control the physical properties of semiconductor quantum dots (QDs) through external perturbations has led to an explosion of research interest from both fundamental and technological standpoints. Here we will report on the fabrication of a novel device, which allows applying strain and electric fields on a single QD simultaneously. Diode-like-nanomembranes containing quantum dots are integrated onto piezoelectric actuators via gold thermo-compression bonding. Different diode-like-structures (n-i-Schottky and p-i-n diodes) will be presented and the optical properties of embedded dots will be discussed. By applying biases to the piezoelectric actuator we can reversibly shift the emission energy of a single QD by more than 10 meV, while by applying a bias to the diode structure we can control the charge state of the QD or excite electroluminescence. The latter result represents the first demonstration of a strain-tuneable Light-Emitting Diode (LED) based on single quantum dots, a device which might be of high potential interest for quantum information technology.