Laterally extended states of interlayer excitons in reconstructed MoSe2/WSe2 heterostructures
Year: 2025
Type: article
Abstract: Heterostructures made from 2D transition-metal dichalcogenides are known as ideal platforms to explore excitonic phenomena ranging from correlated moiré excitons to degenerate interlayer exciton ensembles. So far, it is assumed that the atomic reconstruction appearing in some of the heterostructures gives rise to a dominating localization of the exciton states. We demonstrate that the center-of-mass wavefunction of the excitonic states in reconstructed MoSe2/WSe2 heterostructures can extend well beyond the moiré periodicity of the investigated heterostructures. The results are based on real-space calculations yielding a lateral potential map for interlayer excitons within the strain-relaxed heterostructures with weak random disorder, as expected for realistic samples, and the corresponding real-space center-of-mass excitonic wavefunctions. We combine the theoretical results with cryogenic photoluminescence experiments, which support the computed level structure and relaxation characteristics of the interlayer excitons.
Source: npj Quantum Materials
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,890
Awards: G1417568768, G1823570052, G2178218803, G2442584775, G269273419, G2739337931, G3137453513, G3348283342, G4091144171, G4162329948, G4291769459, G4806815962, G6718509927, G7068274489, Korrelationen in van der Waals [Hetero]Strukturen: spektroskopische Signaturen von Quasiteilchen und kollektiven Anregungen, G785359581, G7879866177, G8254293631, Wechselwirkungsvielteilchenphasen von optisch erzeugten ExzitonEnsembles in van der Waals Heterostrukturen, G8346758930, G898758523
OpenAlex ID: W4414248132