Termination dependence of the surface states in Pb$_{2}$Pd

TL;DR

This paper investigates how different surface terminations in Pb$_{2}$Pd influence the emergence and characteristics of topological surface states, revealing termination-dependent surface state behaviors observed via ARPES.

Contribution

It provides a detailed analysis of the termination dependence of surface states in Pb$_{2}$Pd, highlighting the conditions for Dirac cone-like and parabolic surface states.

Findings

Pd-terminated (001) surface hosts Dirac cone-like surface states

(110) surface exhibits visible parabolic-like surface states near Fermi level

Surface termination critically affects topological surface state realization

Abstract

Topological properties of systems lead to the emergence of surface states which can be observed experimentally within the angle-resolved photoemission spectroscopy (ARPES) measurements. Recently, the topological properties of Pb$_{2}$Pd were reported. In this paper, we discuss the role of the surface termination on the realized surface states. We discuss the termination dependence of the surface state for (001) and (110) surface. We demonstrate that the Pd terminated (001) surface allow realization of the Dirac cone-like surface state. In the case (110) we observe well visible surface states with parabolic-like dispersion relation in close vicinity of the Fermi level.