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Lecture J. Elzerman


16 November 2010 FWN-Building 5116.0116, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. J. Elzerman
Affiliation: Institute of Quantum Electronics, ETH, Zurich, Switzerland
Title: Quantum optics with coupled spins in semiconductor nanostructures
Date: Tue Nov 16, 2010
Start: 11.30
Location: FWN-Building 5116.0116
Host: B.J. van Wees
Telephone: +31 50 363 4974


Semiconductor nanostructures offer remarkable opportunities for developing devices with new quantum-optical functionalities: they are host to electronic and nuclear spins that can be very robust against disturbance from the environment, and their properties can be tailored using the well-established methods of nanotechnology.
I will present our efforts to optically couple and control spins in vertically stacked self-assembled quantum dot molecules. We used absorption and resonance fluorescence measurements to demonstrate conditional interaction of two coupled quantum dots, where the optical spectrum of one dot is controlled by the absorption of a single photon in the partner dot, similar to an optical transistor. We then showed that we can use a magnetic field to tune the system´┐Żs ground state from a spin triplet to a spin singlet character. Finally, we developed a quantum dot device in which two single spins in separate dots experience a very strong exchange interaction. We took advantage of unexpectedly fast spin relaxation to induce laser amplification on a Raman transition. This might be used in the development of a nanolaser with a single solid-state quantum emitter as the gain medium.
Last modified:22 October 2012 2.31 p.m.