# Floquet Second-Order Topological Superconductor Driven via Ferromagnetic Resonance

## TL;DR

This paper proposes a Floquet-driven layered system that can host various topological superconducting phases, including second-order Majorana states, with potential experimental realizations.

## Contribution

It introduces a novel Floquet triple-layer setup that supports multiple topological phases, including second-order topological superconductors with Majorana corner states.

## Key findings

- Supports second-order Floquet Majorana corner states
- Hosts Floquet helical topological superconductor with edge modes
- Contains a stable Floquet Weyl phase

## Abstract

We consider a Floquet triple-layer setup composed of a two-dimensional electron gas with spin-orbit interactions, proximity coupled to an s-wave superconductor and to a ferromagnet driven at resonance. The ferromagnetic layer generates a time-oscillating Zeeman field which competes with the induced superconducting gap and leads to a topological phase transition. The resulting Floquet states support a second-order topological superconducting phase with a pair of localized zero-energy Floquet Majorana corner states. Moreover, the phase diagram comprises a Floquet helical topological superconductor, hosting a Kramers pair of Majorana edge modes protected by an effective time-reversal symmetry, as well as a gapless Floquet Weyl phase. The topological phases are stable against disorder and parameter variations and are within experimental reach.