Dresden 2020 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: 2D Materials I: Electronic Structure, Excitations, etc. (joint session O/CPP/HL)

CPP 17.12: Vortrag

Montag, 16. März 2020, 13:30–13:45, WIL C107

Ab-initio Exciton-polaritons: Cavity control of two-dimensional Materials — •Simone Latini1, Enrico Ronca1, Hannes Hübener1, Umberto De Giovannini1, and Angel Rubio1,21Max Planck Institute for the Structure and Dynamics of Matter and Center for Free Electron Laser Science, 22761 Hamburg, Germany — 2Center for Computational Quantum Physics (CCQ), The Flatiron Institute, 162 Fifth avenue, New York NY 10010

We put forward a novel way of controlling the optical features of two-dimensional materials by embedding them in a cavity. The cavity light-matter interaction leads to the formation of exciton-polaritons, mixed states of matter and light. We demonstrate a reordering and mixing of bright and dark excitons leading to the direct optical observation of the latter. In type II van-der-Waals heterostructure, we show that the cavity provides control on the stabilization of inter- over intralayer excitons. Our theoretical predictions are based on a newly developed non-perturbative many-body framework that involves the ab-initio solution of the coupled quantized electron-photon Schrödinger equation in a quantum-electrodynamics plus Bethe-Salpeter approach. Within this framework we are able to investigate exciton-polariton states and predict their dispersion and response in a strong cavity light-matter coupling regime. Our method lends itself to the investigation of more complex polaritonic, so called phonoriton, a mixture of excitons, phonons and photons. In particular we were able to identify elusive phonoritonic spectral features observed in a state-of-the-art pump and probe experiment.

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