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Imaging phase slip dynamics in micron-size superconducting rings

机译：成像微米级超导环中的相移动力学

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摘要

We present a scanning probe technique for measuring the dynamics of individual fluxoid transitions in multiply connected superconducting structures. In these measurements, a small magnetic particle attached to the tip of a silicon cantilever is scanned over a micron-size superconducting ring fabricated from a thin aluminum film. We find that near the superconducting transition temperature of the aluminum, the dissipation and frequency of the cantilever changes significantly at particular locations where the tip-induced magnetic flux penetrating the ring causes the two lowest-energy fluxoid states to become nearly degenerate. In this regime, we show that changes in the cantilever frequency and dissipation are well-described by a stochastic resonance (SR) process, wherein small oscillations of the cantilever in the presence of thermally activated phase slips (TAPS) in the ring give rise to a dynamical force that modifies the mechanical properties of the cantilever. Using the SR model, we calculate the average fluctuation rate of the TAPS as a function of temperature over a 32-dB range in frequency, and we compare it to the Langer-Ambegaokar-McCumber-Halperin theory for TAPS in one-dimensional superconducting structures.
机译：我们提出了一种扫描探针技术，用于测量多重连接的超导结构中单个磁通跃迁的动力学。在这些测量中，附着在硅悬臂梁尖端的小磁性粒子在由铝薄膜制成的微米级超导环上进行扫描。我们发现，在铝的超导转变温度附近，悬臂的耗散和频率在特定位置发生显着变化，在特定位置，尖端感应的磁通量穿透环会导致两个最低能量的磁通量态几乎退化。在这种情况下，我们表明，随机共振（SR）过程很好地描述了悬臂频率和耗散的变化，其中，在环中存在热激活相移（TAPS）的情况下，悬臂的小振荡会引起改变悬臂机械性能的动力。使用SR模型，我们计算出TAPS在32 dB频率范围内随温度变化的平均波动率，并将其与一维超导结构中TAPS的Langer-Ambegaokar-McCumber-Halperin理论进行比较。

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  • 来源
    《Physical review》 |2018年第18期|184501.1-184501.13|共13页
  • 作者

    Hryhoriy Polshyn; Tyler R. Naibert; Raffi Budakian;

  • 作者单位

    Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA;

    Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA;

    Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA,Department of Physics, University of Waterloo, Waterloo, ON, Canada N2L3G1,Institute for Quantum Computing, University of Waterloo, Waterloo, ON, Canada N2L3G1,Perimeter Institute for Theoretical Physics, Waterloo, ON, Canada N2L2Y5,Canadian Institute for Advanced Research, Toronto, ON, Canada M5G1Z8;

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