Giant Rashba splitting of quasi-1D surface states on Bi/InAs(110)-(2$\times$1)

TL;DR

This study reveals giant Rashba spin splitting in quasi-1D surface states on Bi/InAs(110)-(2×1), combining experimental ARPES data and theoretical calculations, highlighting potential for spintronic applications.

Contribution

It reports the first observation of large Rashba splitting in quasi-1D surface states on Bi/InAs(110)-(2×1) using ARPES and DFT calculations.

Findings

Rashba parameter $\alpha_{ m R}$ is approximately 5.5 eV ext{ extminus}Å.

Surface states exhibit quasi-1D dispersion and are nearly metallic.

The top of the hole-like surface band is just below the Fermi level.

Abstract

Electronic states on the Bi/InAs(110)-(2$\times$1) surface and its spin-polarized structure are revealed by angle-resolved photoelectron spectroscopy (ARPES), spin-resolved ARPES, and density-functional-theory calculation. The surface state showed quasi-one-dimensional (Q1D) dispersion and a nearly metallic character; the top of the hole-like surface band is just below the Fermi level. The size of the Rashba parameter ($\alpha_{\rm R}$) reached quite a large value ($\sim$5.5 eV\AA). The present result would provide a fertile playground for further studies of the exotic electronic phenomena in 1D or Q1D systems with the spin-split electronic states as well as for advanced spintronic devices.