SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 23: Optomechanics I & Optovibronics
Q 23.5: Vortrag
Mittwoch, 8. März 2023, 12:00–12:15, A320
Nonlinear opto-vibronics in molecular systems — Quansheng Zhang1, •Micheal Reitz1, and Claudiu Genes1,2 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2Department of Physics, University of Erlangen-Nuremberg, Erlangen, Germany
Opto-vibrational interactions in molecular systems occur in a hybrid fashion as light couples to electronic transitions, which in turn are modified by the vibrations of the nuclei. In standard approaches, under the Born-Oppenheimer approximation, the vibronic coupling is a spin-boson interaction modeled by a Holstein Hamiltonian, i.e., an electronic transition between two copies of the same harmonic potential landscape is slightly shifted. However, the potential landscapes for the excited and ground electric states may be different, with two different frequencies for the two harmonic curves. In such a case, the polaron transformation is modified by an operation involving a conditional squeezing operator.
We present here an analytical treatment based on a set of quantum Langevin equations for elective spin operators dressed by oscillations. These equations can be solved under some approximations to obtain information on emission and absorption spectra. Moreover, we propose to exploit the intrinsic nonlinear vibronic interaction to map light states to nuclear vibrations and viceversa. Our results are also applicable to quadratic optomechanics, such as in the membrane-in-the-middle scenario.