Evidence for large Rashba splitting in PtPb4 from Angle-Resolved Photoemission Spectroscopy

TL;DR

This study combines ARPES experiments and DFT calculations to reveal significant Rashba spin splitting in PtPb4, highlighting its potential for spintronic applications due to its electronic structure.

Contribution

The paper provides the first experimental evidence of large Rashba splitting in PtPb4, supported by theoretical calculations, expanding understanding of its topological and spintronic properties.

Findings

Significant Rashba splitting observed at the Γ point.

Fermi surface consists of electron and hole pockets.

Agreement between ARPES data and DFT calculations.

Abstract

We studied the electronic structure of PtPb$_{4}$ using laser angle-resolved photoemission spectroscopy(ARPES) and density functional theory(DFT) calculations. This material is closely related to PtSn$_{4}$, which exhibits exotic topological properties such as Dirac node arcs. Fermi surface(FS) of PtPb$_{4}$ consists of two electron pockets at the center of the Brillouin zone(BZ) and several hole pockets around the zone boundaries. Our ARPES data reveals significant Rashba splitting at the $\Gamma$ point in agreement with DFT calculations. The presence of Rashba splitting may render this material of potential interest for spintronic applications.