Tuning independently Fermi energy and spin splitting in Rashba systems: Ternary surface alloys on Ag(111)

TL;DR

This study demonstrates how the Fermi energy and Rashba spin splitting in ternary surface alloys on Ag(111) can be independently controlled through compositional tuning, providing insights for spintronic applications.

Contribution

The paper introduces a method to independently tune Fermi energy and Rashba splitting in ternary alloys via concentration adjustments, explained by fundamental mechanisms.

Findings

Fermi energy and Rashba splitting can be independently tuned.

The tuning is achieved by adjusting Bi and Pb concentrations.

Results suggest experimental exploration of Rashba effects based on spin-orbit coupling.

Abstract

By detailed first-principles calculations we show that the Fermi energy and the Rashba splitting in disordered ternary surface alloys (BiPbSb)/Ag(111) can be independently tuned by choosing the concentrations of Bi and Pb. The findings are explained by three fundamental mechanisms, namely the relaxation of the adatoms, the strength of the atomic spin-orbit coupling, and band filling. By mapping the Rashba characteristics,i.e.the splitting and the Rashba energy, and the Fermi energy of the surface states in the complete range of concentrations. Our results suggest to investigate experimentally effects which rely on the Rashba spin-orbit coupling in dependence on spin-orbit splitting and band filling.