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Current-Driven Dynamics of Frustrated Skyrmions in a Synthetic Antiferromagnetic Bilayer
Jing Xia, Xichao Zhang, Motohiko Ezawa +4
We report the current-driven dynamics of frustrated skyrmions in an antiferromagnetically exchange coupled bilayer system, where the bilayer skyrmion consists of two monolayer skyr…
Spin torque nano-oscillators based on antiferromagnetic skyrmions
Laichuan Shen, Jing Xia, Guoping Zhao +5
Skyrmion-based spin torque nano-oscillators are potential next-generation microwave signal generators. However, ferromagnetic skyrmion-based spin torque nano-oscillators cannot rea…
Non-Hermitian boundary and interface states in nonreciprocal higher-order topological metals and electrical circuits
Motohiko Ezawa
Non-Hermitian skin-edge states emerge only at one edge in one-dimensional nonreciprocal chains, where all states are localized at the edge irrespective of eigenvalues. The bulk top…
Non-Hermitian higher-order topological states in nonreciprocal and reciprocal systems with their electric-circuit realization
Motohiko Ezawa
A prominent feature of some one-dimensional non-Hermitian systems is that all right-eigenstates of the non-Hermitian Hamiltonian are localized in one end of the chain. The topologi…
Higher-order topological electric circuits and topological corner resonance on the breathing Kagome and pyrochlore lattices
Motohiko Ezawa
Electric circuits are known to realize topological quadrupole insulators. We explore electric circuits made of capacitors and inductors forming the breathing Kagome and pyrochlore…
Topological quantum quench dynamics carrying arbitrary Hopf and second-Chern numbers
Motohiko Ezawa
A quantum quench is a nonequilibrium dynamics governed by the unitary evolution. We propose a two-band model whose quench dynamics is characterized by an arbitrary Hopf number belo…