Mode attraction in Floquet systems with memory: application to magnonics

Abstract

Level attraction is a type of mode hybridization in open systems where instead of forming a hybridization gap, the energy spectrum of two modes coalesce in a region bounded by exceptional points. We demonstrate that this phenomenon can be realized in a Floquet system with memory, which appears in describing linear excitations in a nonlinear driven system with a limit cycle. Linear response of the system in this state is different from its response near thermodynamic equilibrium. We develop a general formalism and provide an example in the context of cavity magnonics, where we show that magnetic excitations in systems driven far from the equilibrium may show level attraction with cavity photons. Our approach works equally well for quantum and semiclassical magnetic dynamics. The theory is formulated so that it can be used in combination with micromagnetic simulations to explore a wide range of experimentally interesting systems.

Published version: 10 pages, 2 figures, PRB style

References in corpus (10)

• The physics of exceptional points
• Unconventional Singularity in Anti-Parity-Time Symmetric Cavity Magnonics
• Correlated electron systems periodically driven out of equilibrium: Floquet + DMFT formalism
• Coherent and Dissipative Cavity Magnonics
• Floquet Cavity Electromagnonics
• Travelling photons mediated interactions between a magnon mode and a cavity photon mode
• Cavity-mediated dissipative spin-spin coupling
• Exceptional points in dissipatively coupled spin dynamics
• Asymptotic Floquet states of non-Markovian systems
• Driven-dissipative Quantum Dynamics in Cavity Magnon-Polariton System