Nontrivial Berry phase and type II Dirac transport in layered material PdTe2

TL;DR

This paper presents evidence of type II Dirac fermions in PdTe2, showing nontrivial Berry phase and Dirac cone dispersion, suggesting its potential as a platform for topological superconductivity.

Contribution

It provides experimental and theoretical evidence of type II Dirac fermions in PdTe2, highlighting its unique electronic properties and potential for topological superconductivity.

Findings

Detection of a small Fermi pocket with nontrivial Berry phase

Observation of a type II Dirac cone dispersion

Identification of PdTe2 as a candidate for topological superconductors

Abstract

Here we report the evidence of the type II Dirac Fermion in the layered crystal PdTe2. The de Haas-van Alphen oscillations find a small Fermi pocket with a cross section of 0.077nm-2 with a nontrivial Berry phase. First-principal calculations reveal that it is originated from the hole pocket of a tilted Dirac cone. Angle Resolved Photoemission Spectroscopy demonstrates a type II Dirac cone featured dispersion. We also suggest PdTe2 is an improved platform to host the topological superconductors.