Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 68: Metal-Semiconductor Hybrids

HL 68.4: Vortrag

Donnerstag, 10. März 2016, 10:30–10:45, H10

Proposal of detecting non secular processes through coherent nanooptical spectroscopy — Markus Krecik, Sven M. Hein, Mario Schoth, and •Marten Richter — Institut für Theoretische Physik, Technische Universität Berlin, Germany

Relaxation or coherence conversion processes are often induced by system-bath interactions. In the theoretical description, it is often sufficient to keep only conversion processes between (excitonic) coherences and populations involving nearly resonant density matrix elements (secular processes). However interesting Non-Markovian signatures potentially involve secular and non secular processes. The dissection of secular and non secular processes is routinely carried out in theory, but the identification of a pure non secular observable in experiment is pending. We propose an experimental signal only with contributions from non secular processes. The signal uses a combination of coherent multidimensional spectroscopy and nanoplasmonic metal structures. For controlling the optical selection rules (required by the protocol) the nanooptical structure provides dynamical switches between spatial constant optical fields and field gradients. The signal is calculated for the example of a colloidal semiconductor quantum dot.

[1] Phys. Rev. A 92, 052113 (2015)