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Current-Carrying Superconducting Channels: Bifurcation Phenomena

机译:载流超导通道:分叉现象

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We study theoretically how the dynamics of the resistive state in narrow superconducting channels shunted by an external resistor depends on channel's length L, the applied current j, and parameter u characterizing the penetration depth of the electric field in the nonequilibrium superconductors. We show that the current-voltage characteristics of a superconducting channel has different shapes depending on this parameters. It has either step-like or hysteretic behaviour. We explore the bifurcation mechanisms which are responsible for the formation and evolution of phase slip centers, and which are, therefore, strongly influence the current-voltage characteristics. We reveal how the conductivity of the shunt σ changes the properties of the hysteretic current-voltage characteristics.
机译:我们从理论上研究了由外部电阻器分流的超导窄通道中电阻状态的动力学如何取决于通道的长度L,施加的电流j和表征电场在非平衡超导体中的渗透深度的参数u。我们表明,根据该参数,超导通道的电流-电压特性具有不同的形状。它具有步进或滞后行为。我们探讨了分叉机制,这些机制负责相位滑移中心的形成和演化,因此强烈影响电流-电压特性。我们揭示了分流器σ的电导率如何改变磁滞电流-电压特性的特性。

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