Interlayer coupling and ultrafast hot electron transfer dynamics in metallic VSe2/graphene van der Waals heterostructures

TL;DR

This study demonstrates ultrafast hot electron transfer and strong interlayer coupling in VSe2/graphene heterostructures, revealing potential for advanced optoelectronic applications through femtosecond spectroscopy.

Contribution

It provides the first detailed investigation of interlayer coupling and hot electron dynamics in VSe2/graphene heterostructures, highlighting ultrafast transfer processes.

Findings

Hot electrons transfer from VSe2 to graphene within 100 fs.

Interlayer coupling evidenced by coherent acoustic phonon dynamics.

Efficient thermal energy transfer to substrates.

Abstract

Atomically thin vanadium diselenide (VSe2 ) is a two-dimensional transition metal dichalcogenide exhibiting attractive properties due to its metallic 1T-phase. With the recent development of methods to manufacture high-quality monolayer VSe 2 on van der Waals materials, the outstanding properties of VSe2 -based heterostructures have been widely studied for diverse applications. Dimensional reduction and interlayer coupling with a van der Waals substrate lead to its distinguishable characteristics from its bulk counterparts. However, only a few fundamental studies have investigated the interlayer coupling effects and hot electron transfer dynamics in VSe2 heterostructures. In this work, we reveal ultrafast and efficient interlayer hot electron transfer and interlayer coupling effects in VSe2 /graphene heterostructures. Femtosecond time-resolved reflectivity measurements showed that hot electrons in VSe 2 were transferred to graphene within a 100-fs timescale with high efficiency. Besides, coherent acoustic phonon dynamics indicated interlayer coupling in VSe2 /graphene heterostructures and efficient thermal energy transfer to three-dimensional substrates. Our results provide valuable insights into the intriguing properties of metallic transition metal dichalcogenide heterostructures and motivate designing optoelectronic and photonic devices with tailored properties.