Electrical transport of graphene-contacted thin layer pentagonal transition metal dichalcogenide (TMDC)

2D materials with puckered pentagonal structures have been predicted to show exotic new properties due to in-plane anisotropy. Yet there have been limited experimental transport studies on such materials due to the scarcity of this type of materials and difficulties in achieving ohmic contact, especially for thin layers that have larger band gaps. Most of the current studies focus on Palladium diselenide PdSe2, which is air stable and can be mechanically exfoliated into thin layers. In this work, we use graphene to contact atomically thin PdSe2, which significantly reduces the contact resistance, therefore facilitated magnetotransport studies at low temperatures and enabled observation of new features that have never been discussed in previous studies.