中国物理B ›› 2022, Vol. 31 ›› Issue (3): 37404-037404.doi: 10.1088/1674-1056/ac3cb1

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Dynamic vortex Mott transition in triangular superconducting arrays

Zi-Xi Pei(裴子玺)1,2, Wei-Gui Guo(郭伟贵)1,2, and Xiang-Gang Qiu(邱祥冈)1,2,3,†   

  1. 1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
  • 收稿日期:2021-11-04 修回日期:2021-11-22 接受日期:2021-11-24 出版日期:2022-02-22 发布日期:2022-02-24
  • 通讯作者: Xiang-Gang Qiu E-mail:xgqiu@iphy.ac.cn
  • 基金资助:
    X.G.Q. acknowledges the support from the National Natural Science Foundation of China (Grant Nos. 11974412 and 11774400) and the National Key R&D Program of China (Grant Nos. 2017YFA0302903 and 2018YFA0305703).

Dynamic vortex Mott transition in triangular superconducting arrays

Zi-Xi Pei(裴子玺)1,2, Wei-Gui Guo(郭伟贵)1,2, and Xiang-Gang Qiu(邱祥冈)1,2,3,†   

  1. 1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
    2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
  • Received:2021-11-04 Revised:2021-11-22 Accepted:2021-11-24 Online:2022-02-22 Published:2022-02-24
  • Contact: Xiang-Gang Qiu E-mail:xgqiu@iphy.ac.cn
  • Supported by:
    X.G.Q. acknowledges the support from the National Natural Science Foundation of China (Grant Nos. 11974412 and 11774400) and the National Key R&D Program of China (Grant Nos. 2017YFA0302903 and 2018YFA0305703).

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摘要： The proximity-coupled superconducting island arrays on a metallic film provide an ideal platform to study the phase transition of vortex states under mutual interactions between the vortex and potential landscape. We have developed a top-down microfabrication process for Nb island arrays on Au film by employing an Al hard mask. A current-induced dynamic vortex Mott transition has been observed under the perpendicular magnetic fields of $f$ magnetic flux quantum per unit cell, which is characterized by a dip-to-peak reversal in differential resistance d$V$/d$I$ vs. $f$ curve with the increasing current. The d$V$/d$I$ vs. $I$ characteristics show a scaling behavior near the magnetic fields of $f= {1}/{2}$ and $f=1$, with the critical exponents $\varepsilon$ of 0.45 and 0.3, respectively, suggesting different universality classes at these two fields.

关键词: microfabrication, superconducting array, Mott transition

Abstract: The proximity-coupled superconducting island arrays on a metallic film provide an ideal platform to study the phase transition of vortex states under mutual interactions between the vortex and potential landscape. We have developed a top-down microfabrication process for Nb island arrays on Au film by employing an Al hard mask. A current-induced dynamic vortex Mott transition has been observed under the perpendicular magnetic fields of $f$ magnetic flux quantum per unit cell, which is characterized by a dip-to-peak reversal in differential resistance d$V$/d$I$ vs. $f$ curve with the increasing current. The d$V$/d$I$ vs. $I$ characteristics show a scaling behavior near the magnetic fields of $f= {1}/{2}$ and $f=1$, with the critical exponents $\varepsilon$ of 0.45 and 0.3, respectively, suggesting different universality classes at these two fields.

Key words: microfabrication, superconducting array, Mott transition

中图分类号:  (Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses))

  • 74.25.Uv
74.45.+c (Proximity effects; Andreev reflection; SN and SNS junctions) 81.16.Rf (Micro- and nanoscale pattern formation)