Shubnikov-de Haas Oscillations in 2D $\text{PtSe}_2$: A fermiological Charge Carrier Investigation

Abstract

High magnetic field and low temperature transport is carried out in order to characterize the charge carriers of $\text{PtSe}_2$. In particular, the Shubnikov-de Haas oscillations arising at applied magnetic field strengths $\gtrsim 4.5\,\text{T}$ are found to occur exclusively in plane and emerge at a layer thickness of $\approx 18\,\text{nm}$, increasing in amplitude and decreasing in frequency for thinner $\text{PtSe}_2$ flakes. Moreover, the quantum transport time, Berry phase, Dingle temperature and cyclotron mass of the charge carriers are ascertained. The emergence of weak antilocalization (WAL) lies in contrast to the presence of magnetic moments from Pt vacancies. An explanation is provided on how WAL and the Kondo effect can be observed within the same material. Detailed information about the charge carriers and transport phenomena in $\text{PtSe}_2$ is obtained, which is relevant for the design of prospective spintronic and orbitronic devices and for the realization of orbital Hall effect-based architectures.