Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide Understanding and controlling the electronic properties of two-dimensional materials are crucial for their potential applications in nano- and optoelectronics. Monolayer transition metal dichalcogenides have garnered significant interest due to their strong light–matter interaction and extreme sensitivity of the band structure to the presence of photogenerated electron–hole pairs. In this study, we investigate the transient electronic structure of monolayer WS 2 on a graphene substrate after resonant excitation of the A-exciton using time- and angle-resolved photoemission spectroscopy. We observe a pronounced band structure renormalization, including a substantial reduction of the transient band gap in good quantitative agreement with our ab initio theory, revealing the importance of both intrinsic WS 2 and extrinsic substrate contributions. Our findings deepen the fundamental understanding of band structure dynamics in two-dimensional materials and offer valuable insights for the development of novel electronic and optoelectronic devices based on monolayer TMDs and their heterostructures with graphene.
Source: Nano Letters
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
Awards: Quantengase in Moirégeordneten und rekonstruierten Heterostrukturen: Effektive Dimensionalitäten, Hybridzustände und Wechselwirkungen, FOR 5242: Proximity induzierte Korrelationseffekte in niedrigdimensionalen Strukturen, G6196935697, G805117988, SFB 1277: Emergente relativistische Effekte in der Kondensierten Materie: Von grundlegenden Aspekten zu elektronischer Funktionalität
OpenAlex ID: W4406182802