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首页> 外文期刊>Philosophical magazine, B. Physics of condensed matter, electronic, optical, and magnetic properties >Supercurrent decay by vortex nucleation in the presence of an array of pinning centres: a renormalization group approach
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Supercurrent decay by vortex nucleation in the presence of an array of pinning centres: a renormalization group approach

机译：在存在多个钉扎中心的情况下通过涡流形核产生的超电流衰减：重新归一化组方法

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We study the phenomenon of decay of a supercurrent in a superconducting thin film due to the spontaneous homogeneous nucleation of quantized vortex-antivortex pairs in the absence of an external magnetic field and in the presence of a periodic pinning potential. We describe the vortex nucleation by means of a Schwinger-type path-integral calculation including the effects of quantum dissipation. The overdamped case is treated exactly, while the case in which a periodic array of pinning centres is present is dealt with by means of a renormalization group (RG) approach in frequency space. This yields an approximate but very appealing analytic result for the dependence of the Vortex nucleation rate on the externally driven supercurrent. In this formula the rate dependence displays oscillations which are connected to the pinning periodicity and correspond to the vortex nucleation length probing over the pinning sites as the current density is varied. Our RG treatment describes the vortex nucleation process in both the confined and the mobile phases of the dissipation-driven localization transition characterizing the motion of dissipating quantum particles in a periodic potential. [References: 10]
机译：我们研究了在不存在外部磁场且存在周期性钉扎电势的情况下，由于量化的涡旋-反涡旋对的自发均匀成核，超导薄膜中超电流衰减的现象。我们通过包括量子耗散效应的Schwinger型路径积分计算来描述涡旋形核。过度阻尼的情况将得到精确处理，而存在周期性钉扎中心阵列的情况将通过频率空间中的重归一化组（RG）方法进行处理。对于涡旋成核速率对外部驱动的超电流的依赖性，这产生了近似但非常吸引人的分析结果。在此公式中，速率相关性显示出与固定周期相关的振荡，并且随着电流密度的变化，该振荡对应于在固定位点探测的涡旋成核长度。我们的RG处理描述了由耗散驱动的局部转变的局限和移动相中的涡旋成核过程，表征了耗散量子粒子在周期性电势中的运动。 [参考：10]

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