Polaron-induced changes in moir\'e exciton propagation in twisted van der Waals heterostructures

Ermin Malic (1) ((1) Department of Physics; Germany); Giuseppe Meneghini (1); Philipps University Marburg; Samuel Brem (1); Willy Knorr (1)

Polaron-induced changes in moir\'e exciton propagation in twisted van der Waals heterostructures

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arxiv 2401.07703 v1 pith:BSSMN2TE submitted 2024-01-15 cond-mat.mes-hall

Polaron-induced changes in moir\'e exciton propagation in twisted van der Waals heterostructures

Willy Knorr (1) , Samuel Brem (1) , Giuseppe Meneghini (1) , Ermin Malic (1) ((1) Department of Physics , Philipps University Marburg , Germany) This is my paper

classification cond-mat.mes-hall

keywords excitonmoirchangesanglecircdependenthoppingintriguing

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Twisted transition metal dichalcogenides (TMDs) present an intriguing platform for exploring excitons and their transport properties. By introducing a twist angle, a moir\'e superlattice forms, providing a spatially dependent exciton energy landscape. Based on a microscopic many-particle theory, we investigate in this work polaron-induced changes in exciton transport properties in the MoSe$_2$/WSe$_2$ heterostructure. We demonstrate that polaron formation and the associated enhancement of moir\'e excitonic mass lead to a significant band flattening. As a result, the hopping rate and the propagation velocity undergo noticeable temperature and twist-angle dependent changes. We predict a reduction of the hopping strength ranging from 80% at a twist angle of 1$^\circ$ to 30% at 3$^\circ$ at room temperature. The provided microscopic insights into the spatio-temporal exciton dynamics in presence of a moir\'e potential further deepens our understanding of the intriguing moir\'e exciton physics.

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Purely electronic model for exciton-polaron formation in moir\'e heterostructures
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A purely electronic model for exciton-polarons in moiré lattices predicts density-dependent mass renormalization and sign change near correlated insulators.