Signature of a pair of Majorana zero modes in superconducting gold surface states
Signature of a pair of Majorana zero modes in superconducting gold surface states
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DOI：
10.1073/pnas.1919753117
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发表时间：
2020-04-21
影响因子：
11.1
通讯作者：
Moodera, Jagadeesh S.
中科院分区：
文献类型：
--
作者：
Manna, Sujit;Wei, Peng;Moodera, Jagadeesh S.
在某些条件下，超导体中的费米子可以在空间中分成两部分，称为马约拉纳零模，它们不受局部噪声源的退相干影响，是量子计算机的有吸引力的构建块。在与超导体耦合的强自旋-轨道耦合材料中，马约拉纳零模的实验研究取得了可喜的进展。在这里，我们报告签名的马约拉纳零模式的材料平台，利用金的表面状态。利用扫描隧道显微镜探测生长在金纳米线顶部的EuS岛，我们观察到两个分离良好的零偏置隧穿电导峰沿沿着方向的施加磁场，如预期的一对马约拉纳零模式。该平台的优点是具有稳健的能量尺度和使用光刻方法实现复杂设计的可能性。
Under certain conditions, a fermion in a superconductor can separate in space into two parts known as Majorana zero modes, which are immune to decoherence from local noise sources and are attractive building blocks for quantum computers. Promising experimental progress has been made to demonstrate Majorana zero modes in materials with strong spin-orbit coupling proximity coupled to superconductors. Here we report signatures of Majorana zero modes in a material platform utilizing the surface states of gold. Using scanning tunneling microscope to probe EuS islands grown on top of gold nanowires, we observe two well-separated zero-bias tunneling conductance peaks aligned along the direction of the applied magnetic field, as expected for a pair of Majorana zero modes. This platform has the advantage of having a robust energy scale and the possibility of realizing complex designs using lithographic methods.