Hysteresis behavior in current-driven stationary resonance induced by nonlinearity in the coupled sine-Gordon equation

Recently novel current-driven resonant states characterized by the $π$-phase kinks were proposed in the coupled sine-Gordon equation. In these states hysteresis behavior is observed with respect to the application process of current, and such behavior is due to nonlinearity in the sine term. Varying strength of the sine term, there exists a critical strength for the hysteresis behavior and the amplitude of the sine term coincides with the applied current at the critical strength.

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