Dynamical Majorana Ising spin response in a topological superconductor-magnet hybrid by microwave irradiation

TL;DR

This paper proposes a method to detect Majorana modes in topological superconductor-magnet hybrids by controlling microwave irradiation and magnetic field, revealing their topological spin dynamics and enabling new spin device applications.

Contribution

It introduces a novel magnetic detection technique for Majorana Ising spins using microwave control and magnetic field adjustments in topological superconductor-magnet systems.

Findings

Dissipative and non-dissipative Majorana spin dynamics can be toggled.

Microwave irradiation enhances Gilbert damping as a signature of Majorana modes.

The method provides a magnetic probe for Majorana topological states.

Abstract

We study a dynamical spin response of surface Majorana modes in a topological superconductor-magnet hybrid under microwave irradiation. We find a method to toggle between dissipative and non-dissipative Majorana Ising spin dynamics by adjusting the external magnetic field angle and the microwave frequency. This reflects the topological nature of the Majorana modes, enhancing the Gilbert damping of the magnet, thereby, providing a detection method for the Majorana Ising spins. Our findings illuminate a magnetic probe for Majorana modes, paving the path to innovative spin devices.