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Monolayer jacutingaite (Pt$_2$HgSe$_3$) has been recently identified as acandidate quantum spin Hall system with a 0.5 eV band gap, but no transportmeasurements have been performed so far on this material, neither in monolayernor in the bulk. By using a dedicated high-pressure technique, we grow crystalsenabling the exfoliation of 50-100 nm thick layers and the realization ofdevices for controlled transport experiments. Magnetoresistance measurementsindicate that jacutingaite is a semimetal, exhibiting Shubnikov-de Haas (SdH)resistance oscillations with a multi-frequency spectrum. We adapt theLifshitz-Kosevich formula to analyze quantitatively the SdH resistanceoscillations in the presence of multiple frequencies, and find that theexperimental observations are overall reproduced well by band structureab-initio calculations for bulk jacutingaite. Together with the relatively highelectron mobility extracted from the experiments ($\approx 2000$ cm$^2$/Vs,comparable to what is observed in WTe$_2$ crystals of the same thickness), ourresults indicate that monolayer jacutingaite should provide an excellentplatform to investigate transport in 2D quantum spin Hall systems.

Multi-frequency Shubnikov-de Haas oscillations in topological semimetal Pt$_2$HgSe$_3$