Chiu Ching-Kai, Machida T, Huang Yingyi, Hanaguri T, Zhang Fu-Chun
Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China.
RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan.
Sci Adv. 2020 Feb 28;6(9):eaay0443. doi: 10.1126/sciadv.aay0443. eCollection 2020 Feb.
The iron-based superconductor FeTe Se is one of the material candidates hosting Majorana vortex modes residing in the vortex cores. It has been observed by recent scanning tunneling spectroscopy measurement that the fraction of vortex cores having zero-bias peaks decreases with increasing magnetic field on the surface of FeTe Se . The hybridization of two Majorana vortex modes cannot simply explain this phenomenon. We construct a three-dimensional tight-binding model simulating the physics of over a hundred Majorana vortex modes in FeTe Se . Our simulation shows that the Majorana hybridization and disordered vortex distribution can explain the decreasing fraction of the zero-bias peaks observed in the experiment; the statistics of the energy peaks off zero energy in our Majorana simulation are in agreement with the experiment. These agreements lead to an important indication of scalable Majorana vortex modes in FeTe Se . Thus, FeTe Se can be one promising platform having scalable Majorana qubits for quantum computing.
铁基超导体FeTe₀.₅Se₀.₅是一种可能存在于涡旋核中的马约拉纳涡旋模式的候选材料。最近的扫描隧道光谱测量观察到，在FeTe₀.₅Se₀.₅表面，具有零偏置峰的涡旋核的比例随着磁场的增加而降低。两个马约拉纳涡旋模式的杂化不能简单地解释这一现象。我们构建了一个三维紧束缚模型来模拟FeTe₀.₅Se₀.₅中一百多个马约拉纳涡旋模式的物理过程。我们的模拟表明，马约拉纳杂化和无序的涡旋分布可以解释实验中观察到的零偏置峰比例的下降；我们的马约拉纳模拟中偏离零能量的能量峰的统计结果与实验一致。这些一致性为FeTe₀.₅Se₀.₅中可扩展的马约拉纳涡旋模式提供了一个重要指示。因此，FeTe₀.₅Se₀.₅可以成为一个有前景的平台，拥有用于量子计算的可扩展马约拉纳量子比特。
