SPM特集号「プローブ顕微鏡が拓く世界」
超低温走査型トンネル顕微鏡を用いたトポロジカル超伝導体におけるマヨラナ準粒子探索
2022 年 65 巻 2 号 p. 53-58
詳細
2022 年 65 巻 2 号 p. 53-58
We have systematically examined a large number of vortices in the topological superconductor Fe(Se,Te), using a dilution-refrigerator scanning tunneling microscope. We found that a certain number of vortices possess the zero energy vortex bound state (ZVBS) below 20 µeV suggesting its Majorana bound-state origin, but others do not. Interestingly, the emergence of the ZVBS is not related to the preexisting chemical and electronic disorders, and the fraction of vortices with the ZVBS systematically decreases with increasing magnetic field, suggesting the importance of the inter-vortex interaction. These results provide an important insight into a way to control Majorana quasiparticles for future applications.
