Spin Polarization and Dichroism Effects by Electric Field

TL;DR

This paper demonstrates that electric fields can induce spin polarization and dichroism in ARPES measurements of spin-orbit systems, revealing effects similar to the spin Hall effect that can be directly observed with ARPES.

Contribution

It introduces a method to detect spin Hall effect-like phenomena through ARPES without requiring net spin current measurement.

Findings

Electric field induces measurable spin polarization in ARPES.

Dichroism effects are observable due to electric field influence.

ARPEs can verify spin Hall effects in individual bands.

Abstract

We show that electric field can induce spin polarization and dichroism effects in angle resolved photoemission spectroscopy (ARPES) in spin orbit coupling systems. The physical origin behind the effects essentially is the same as the spin Hall effect induced by the electric field. Since the ARPES experiments have both energy and momentum resolutions, the spin Hall effect can be directly verified by the ARPES experiments for individual band even if there is no net spin current.