Nanoscale Zeeman localization of charge carriers in diluted magnetic semiconductor-permalloy hybrids

TL;DR

This paper explores how inhomogeneous magnetic fields in magnetic semiconductor-permalloy hybrids can induce Zeeman localization of charge carriers, revealing chiral states with potential experimental detection.

Contribution

It demonstrates the formation of Zeeman localized states at the interface due to the giant Zeeman response and non-uniform magnetic fields, a novel mechanism for charge carrier localization.

Findings

Zeeman localized states are formed at the interface.

Chirality of states is controlled by permalloy disk magnetization.

Energy spectrum and eigenstates are theoretically calculated.

Abstract

We investigate the possibility of charge carrier localization in magnetic semiconductors due to the presence of a highly inhomogeneous external magnetic field. As an example, we study in detail the properties of a magnetic semiconductor-permalloy disk hybrid system. We find that the giant Zeeman respose of the magnetic semiconductor in conjuction with the highly non-uniform magnetic field created by the vortex state of a permalloy disk can lead to Zeeman localized states at the interface of the two materials. These trapped state are chiral, with chirality controlled by the orientation of the core magnetization of the permalloy disk. We calculate the energy spectrum and the eigenstates of these Zeeman localized states, and discuss their experimental signatures in spectroscopic probes.