Surface magnon spectra of nodal loop semimetals

TL;DR

This paper explores the relationship between the topological bulk structure and magnetic surface states in nodal loop semimetals, analyzing magnon spectra and potential experimental verification methods.

Contribution

It introduces a novel connection between surface topological features and magnetic properties, including magnon spectrum calculations under electron interactions.

Findings

Identification of magnetic characteristics of drumhead surface states

Calculation of magnon spectra considering electron-electron interactions

Proposed experimental verification via spin polarized electron energy loss spectroscopy

Abstract

In this paper we establish a connection between the bulk topological structure and the magnetic properties of drumhead surface states of nodal loop semimetals. We identify the magnetic characteristics of the surface states and compute the system's magnon spectrum by treating electron-electron interactions on a mean-field level. We draw attention to a subtle connection between a Lifshitz-like transition of the surface states driven by mechanical distortions and the magnetic characteristics of the system. Our findings may be experimentally verified e.g. by spin polarized electron energy loss spectroscopy of nodal semimetal surfaces.