Majorana Spin Current Generation by Dynamic Strain

TL;DR

This paper demonstrates that dynamic strain can generate spin currents from Majorana fermions on the surface of topological superconductors, providing a potential method to detect these elusive particles.

Contribution

It introduces a novel mechanism where nonuniform dynamic strains induce spin currents of Majorana fermions, linking strain dynamics to Majorana surface states.

Findings

Spin current driven by dynamic strain on Sr3SnO surface

Frequency dependence reflects Majorana energy dispersion

Spin current can serve as a probe for Majorana fermions

Abstract

Majorana fermions that emerge on the surface of topological superconductors are charge neutral but can have higher-rank electric multipoles by allowing for account time-reversal and crystalline symmetries. Applying the general classification of these multipoles, we show that the spin current of Majorana fermions is driven by spatially nonuniform dynamic strains on the (001) surface of superconducting antiperovskite Sr3SnO. We also find that the frequency dependence of the Majorana spin current reflects the energy dispersion of Majorana fermions. Our results suggest that the spin current can be a probe for Majorana fermions.