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Two-dimensional crystals of semimetallic van der Waals materials hold muchpotential for the realization of novel phases, as exemplified by the recentdiscoveries of a polar metal in few layer 1T'-WTe$_2$ and of a quantum spinHall state in monolayers of the same material. Understanding these phases isparticularly challenging because little is known from experiment about themomentum space electronic structure of ultrathin crystals. Here, we reportdirect electronic structure measurements of exfoliated mono-, bi-, andfew-layer 1T'-WTe$_2$ by laser-based micro-focus angle resolved photoemission.This is achieved by encapsulating with monolayer graphene a flake of WTe$_2$comprising regions of different thickness. Our data support the recentidentification of a quantum spin Hall state in monolayer 1T'-WTe$_2$ and revealstrong signatures of the broken inversion symmetry in the bilayer. We finallydiscuss the sensitivity of encapsulated samples to contaminants followingexposure to ambient atmosphere.

Microfocus laser-ARPES on encapsulated mono-, bi-, and few-layer 1T'-WTe$_2$