  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.
