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HL: Fachverband Halbleiterphysik

HL 9: 2D Materials and Heterostructures: Interlayer Excitons

HL 9.8: Talk

Monday, March 18, 2024, 17:00–17:15, EW 201

Theory of interlayer excitons dynamics in 2D TMDCs Heterolayers including reconstruction through strain and disorder — •Marten Richter — Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin, Berlin, Germany

After combining two TMDC monolayers to form a heterolayer small angles between the lattices lead to the formation of Moiré structures.

Recently it has been shown, that strain leads to a reconstruction of the domains formed by the Moiré structure. This contribution uses reconstructed strain fields with some disorder as a basis to calculate the potential landscape of electrons and holes forming interlayer excitons.

Opposed to the common solution of the center-of-mass exciton wave function in reciprocal space, here the wave function is solved in real space to accommodate disorder and to provide additional insights into the structure of exciton states. Using the obtained exciton basis exciton-phonon scattering elements and lineshapes are calculated after a polaron transformation, which allows the calculation of exciton relaxation and realistic optical signals such as linear absorption, PL.

Keywords: Reconstruction; electron-phonon relaxation; strain; optical spectroscopy