Spectral functions of CVD grown MoS$_2$ monolayers after chemical transfer onto Au surface

TL;DR

This study demonstrates that using nano-ARPES with a polystyrene-assisted transfer and annealing enables high-resolution spectral analysis of chemically transferred MoS2 monolayers, revealing detailed electronic features.

Contribution

It introduces a novel method combining nano-ARPES and transfer techniques to analyze chemically transferred 2D materials with high resolution.

Findings

Clear ARPES spectral features observed in transferred MoS2

Detection of spin-orbit splitting and band renormalization

Method enables study of exotic quasi-particles in vdW heterostructures

Abstract

The recent rise of van der Waals (vdW) crystals has opened new prospects for studying versatile and exotic fundamental physics with future device applications such as twistronics. Even though the recent development on Angle-resolved photoemission spectroscopy (ARPES) with Nano-focusing optics, making clean surfaces and interfaces of chemically transferred crystals have been challenging to obtain high-resolution ARPES spectra. Here, we show that by employing nano-ARPES with submicron sized beam and polystyrene-assisted transfer followed by annealing process in ultra-high vacuum environment, remarkably clear ARPES spectral features such as spin-orbit splitting and band renormalization of CVD-grown, monolayered MoS2 can be measured. Our finding paves a way to exploit chemically transferred crystals for measuring high-resolution ARPES spectra to observe exotic quasi-particles in vdW heterostructures.