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|
|Host:||B.J. van Wees|
|Telephone:||+31 50 363 4974|
AbstractSemiconductor 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�s 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.|