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首页> 外文期刊>Physical review >Stability of dynamic coherent states in intrinsic Josephson-junction stacks near internal cavity resonance
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Stability of dynamic coherent states in intrinsic Josephson-junction stacks near internal cavity resonance

机译：内腔共振附近本征约瑟夫森结堆叠中动态相干态的稳定性

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摘要

Stacks of intrinsic Josephson junctions in the resistive state can by efficiently synchronized by the internal cavity mode resonantly excited by the Josephson oscillations. We study the stability of dynamic coherent states near the resonance with respect to small perturbations. Three states are considered: the homogeneous and alternating-kink states in zero magnetic field and the homogeneous state in the magnetic field near the value corresponding to half flux quantum per junction. We found two possible instabilities related to the short-scale and long-scale perturbations. The homogeneous state in modulated junction is typically unstable with respect to the short-scale alternating phase deformations unless the Josephson current is completely suppressed in one half of the stack. The kink state is stable with respect to such deformations and homogeneous state in the magnetic field is only stable within a certain range of frequencies and fields. Stability with respect to the long-range deformations is controlled by resonance excitations of fast modes at finite wave vectors and typically leads to unstable range of the wave vectors. This range shrinks with approaching the resonance and increasing the in-plane dissipation. As a consequence, in finite-height stacks the stability frequency range near the resonance increases with decreasing the height.
机译：处于电阻状态的本征约瑟夫森结的堆叠可以通过由约瑟夫森振荡共振激发的内腔模式来有效地同步。我们研究了相对于小扰动在共振附近的动态相干态的稳定性。考虑了三种状态：零磁场中的均质和交变态以及磁场的均质状态接近每个结的半通量量子所对应的值。我们发现了两种与短期和长期扰动有关的不稳定性。除非在堆叠的一半中完全抑制了约瑟夫森电流，否则调制结中的均匀状态通常相对于短尺度交替相位变形是不稳定的。对于这种变形，扭折状态是稳定的，并且磁场中的均匀状态仅在一定频率和磁场范围内是稳定的。关于远距离变形的稳定性由有限波矢量处的快速模式的共振激发控制，并且通常导致波矢量的范围不稳定。随着接近谐振并增加平面内耗散，该范围缩小。结果，在有限高度的堆叠中，谐振附近的稳定频率范围随高度的减小而增加。

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