Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 95: Poster IV B (Quantum dots and wires: Prepration, characterization, optical properties, and transport)

HL 95.16: Poster

Thursday, March 19, 2015, 14:00–20:00, Poster B

Inspection of Relaxation by Coherent Spectroscopy and Nanoplasmonics — •Markus Krecik, Mario Schoth, Sven M. Hein, and Marten Richter — Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany

Coherent multidimensional spectroscopy allows for analysis of exciton-phonon relaxation. Nanoplasmonics allows to dynamically induce gradient fields, which relax dipole selection rules.

Through the combination of coherent spectroscopy and nanoplasmonics, we provide a way for studying relaxation between dipole-forbidden and dipole-allowed states: A quantum emitter is placed in a plasmonic structure, an excitation pulse controls electric field gradients and thus excitation of dipole-forbidden states. Multidimensional spectroscopy with an appropriate choice of gradient and non-gradient pulses gives us enhanced control over the relaxation process.

The possibilities are illustrated on a CdSe quantum dot using photoelectron-emission detection.