Tunable lateral displacement and spin beam splitter for ballistic electrons in two-dimensional magnetic-electric nanostructures

TL;DR

This paper explores how to control lateral displacements of ballistic electron beams in a 2D electron gas using magnetic and electric modulations, enabling a tunable spin beam splitter for spintronic applications.

Contribution

It introduces a novel method to achieve tunable lateral displacements and a complete spin beam splitting in 2D electron gases with ferromagnetic stripe configurations.

Findings

Displacements can be positive or negative and are controllable.

A spin beam splitter can be realized to separate spin-up and spin-down electrons.

The method is efficient and tunable based on electric and magnetic parameters.

Abstract

We investigate the lateral displacements for ballistic electron beams in a two-dimensional electron gas modulated by metallic ferromagnetic (FM) stripes with parallel and antiparallel (AP) magnetization configurations. It is shown that the displacements are negative as well as positive, which can be controlled by adjusting the electric potential induced by the applied voltage and the magnetic field strength of FM stripes. Based on these phenomena, we propose an efficient way to realize a spin beam splitter, which can completely separate spin-up and spin-down electron beams in the AP configuration by their corresponding spatial positions.