Enhanced critical magnetic field for monoatomic-layer superconductor by Josephson junction steps
Enhanced critical magnetic field for monoatomic-layer superconductor by Josephson junction steps
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通过约瑟夫森结步骤增强单原子层超导体的临界磁场
DOI：
10.1103/physrevb.103.085416
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发表时间：
2021
影响因子：
3.7
通讯作者：
Hasegawa Yukio
中科院分区：
文献类型：
--
作者：
Oguro Fumikazu;Sato Yudai;Asakawa Kanta;Haze Masahiro;Hasegawa Yukio
我们研究了在半导体衬底上形成的单原子层超导体，并研究了台阶在超导性质中的作用。在本研究中，我们发现Si（111）-Al_2O_3 × Al_2O_43 Pb重构结构的台阶在面外磁场的作用下显著地破坏了超导原子层的电子态，并保持了类约瑟夫森涡旋。由于强退耦，宽度小于三倍相干长度的窄台阶表现为超导纳米条带，并且对面外磁场表现出大的临界场。由于单层超导体本身具有很强的抗面内磁场的能力，因此可以通过控制原子层超导体中的台阶排列来定制对所有方向的磁场都具有高度耐受性的超导材料。
We have studied the monoatomic-layer superconductors formed on semiconducting substrates and investigated the role of steps in superconducting properties. In the present study we found that the steps of the Si(111)-√3×√43 Pb reconstructed structure significantly disrupt the electronic states of the superconducting atomic layer and hold Josephson-like vortices under the out-of-plane magnetic field. Because of the strong decoupling, narrow terraces whose width is less than three times the coherence length behave like superconducting nano stripes and exhibit large critical field against the out-of-plane magnetic field. Since monolayer superconductors are intrinsically strong against in-plane magnetic field, superconducting materials highly tolerant against magnetic fields in all directions might be tailored by controlling the step arrangement in the atomic-layer superconductors.