SKM 2021 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 3: Poster Session I

HL 3.2: Poster

Montag, 27. September 2021, 10:00–13:00, P

Quantum Theory of Exciton-Plasmon Coupling in Two-Dimensional Semiconductors functionalized with Metal Nanoparticles — •Lara Greten, Robert Salzwedel, Malte Selig, and Andreas Knorr — Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany

Monolayers of transition metal dichalcogenides (TMDCs) exhibit tigthly bound excitons with large optical amplitudes, originating from a reduced screening of the Coulomb interaction due to the reduced dimensionaly of these ultrathin materials. The latter gives also rise to a high sensivity of such excitons to their environment.

Contrary, the optical response of metal nano-particles is dominated by plasmons which are collective electron oscillations. They facilitate an impressive amplification of the electric near-field and allow to manipulate the electric field on dimensions below the diffraction limit.

In the presented work, we consider theoretically exciton-plasmon coupling in a hybrid structure of a TMDC layer supported by a single metal nano-particle or a two-dimensional array. For this purpose, we develop a Maxwell-Bloch theory where the excitons are described within the Heisenberg equation of motion framework and the metal nano-particles are treated in classical Mie theory.

Our studies reveal new "plexcitonic" eigenstates of the hybrid system. Furthermore, the results confirm that the configuration allows to reach the strong coupling limit which features a Rabi splitting of tens of meV.