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Zero-energy Vortex Bound State in the Superconducting Topological Surface State of Fe(Se,Te)

T. MachidaRIKEN Center for Emergent Matter Science, Wako, JapanYue SunDepartment of Physics and Mathematics, Aoyama Gakuin University, Chuou-ku, Sagamihara, JapanSunseng PyonDepartment of Applied Physics, The University of Tokyo, Bunkyo-ku, Japan竹田駿RIKEN Center for Emergent Matter Science, Wako, JapanShinji TakedaRIKEN Center for Emergent Matter Science, Wako, Japan幸坂祐生Laboratory for Materials and Structures, Tokyo Institute of Technology, Midori-ku, Yokohama, JapanY. KohsakaDepartment of Applied Physics, The University of Tokyo, Bunkyo-ku, Japan花栗哲郎T. Hanaguri笹川崇男T. Sasagawa為ヶ井強T. Tamegai

2020en

ABI

Annotatsiya

Majorana quasiparticles (MQPs) in condensed matter play an important role in strategies for topological quantum computing but still remain elusive. Vortex cores of topological superconductors may accommodate MQPs that appear as the zero-energy vortex bound state (ZVBS). An iron-based superconductor Fe(Se,Te) possesses a superconducting topological surface state that has been investigated by scanning tunneling microscopies to detect the ZVBS. However, the results are still controversial. Here, we performed spectroscopic-imaging scanning tunneling microscopy with unprecedentedly high energy resolution to clarify the nature of the vortex bound states in Fe(Se,Te). We found the ZVBS at 0 $\pm$ 20 $\mu$eV suggesting its MQP origin, and revealed that some vortices host the ZVBS while others do not. The fraction of vortices hosting the ZVBS decreases with increasing magnetic field, while chemical and electronic quenched disorders are apparently unrelated to the ZVBS. These observations elucidate the conditions to achieve the ZVBS, and may lead to controlling MQPs.

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