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arXiv · 1905.09241

Floquet Second-Order Topological Superconductor Driven via Ferromagnetic Resonance

Kirill Plekhanov·Manisha Thakurathi·Daniel Loss·Jelena Klinovaja
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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.

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Kirill Plekhanov, Manisha Thakurathi, Daniel Loss, Jelena Klinovaja. 2019-05-22. Floquet Second-Order Topological Superconductor Driven via Ferromagnetic Resonance. https://doi.org/10.1103/physrevresearch.1.032013

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