k-resolved ultrafast light-induced band renormalization in monolayer WS${}_2$ on graphene

Abstract

Understanding and controlling the electronic properties of two-dimensional materials is crucial for their potential applications in nano- and optoelectronics. Monolayer transition metal dichalcogenides such as WS${}_2$ 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 that is in good quantitative agreement with our {\it ab initio} theory that reveals the importance of both intrinsic WS${}_2$ and extrinsic substrate contributions to the transient band structure of monolayer WS${}_2$. Our findings not only deepen the fundamental understanding of band structure dynamics in two-dimensional materials but also offer valuable insights for the development of novel electronic and optoelectronic devices based on monolayer TMDs and their heterostructures with graphene.

48 pages, 16 figures

References in corpus (7)

• Observation of giant bandgap renormalization and excitonic effects in a monolayer transition metal dichalcogenide semiconductor
• Optical signature of symmetry variations and spin-valley coupling in atomically thin tungsten dichalcogenides
• Carrier Plasmon Induced Nonlinear Band Gap Renormalization in Two-Dimensional Semiconductors
• Direct Determination of Band Gap Renormalization in Photo-Excited Monolayer MoS2
• Renormalization of quasiparticle band gap in doped two-dimensional materials from many-body calculations
• Microscopic understanding of ultrafast charge transfer in van-der-Waals heterostructures
• Exciton-Driven Renormalization of Quasiparticle Band Structure in Monolayer MoS2

Cited by in corpus (2)

• Quasiparticle gap renormalization driven by internal and external screening in a WS${}_2$ device
• Wannier-Function-Based Approach to Coupled Exciton-Phonon-Photon Dynamics in Two-Dimensional Semiconductors