Imaging spin-resolved cyclotron trajectories in the InSb two-dimensional electron gas

TL;DR

This paper demonstrates how spin-resolved cyclotron trajectories in an InSb 2D electron gas can be visualized and manipulated using magnetic fields and scanning gate microscopy, revealing spin-dependent conductance features.

Contribution

It introduces a method to map spin-resolved electron trajectories in a 2D electron gas using magnetic focusing and scanning gate microscopy, highlighting spin-splitting effects.

Findings

Spin-split focusing conductance peaks due to in-plane magnetic field.

Separate mapping of spin-resolved trajectories.

Control of spin-dependent electron paths in InSb 2DEG.

Abstract

We consider spin-resolved cyclotron trajectories in a magnetic focusing device with quantum point source and drain contacts defined within the InSb two-dimensional electron gas and their mapping by the scanning gate microscopy. Besides the perpendicular component of the external magnetic field which bends the electron trajectories we consider an in-plane component which introduces the spin-dependence of the cyclotron radius. We demonstrate that the focusing conductance peaks become spin-split by the in-plane magnetic field component of the order of a few tesla and that the spin-resolved trajectories can be traced separately with the conductance mapping.