Bulk effect and scaling behavior of Majorana Bound States in FeTe_0.55Se_0.45

Majorana bound states (MBS) can arise as quasi-particle excitations in vortex core of p-wave superconductors. Inspired by heterostructure proximity effect, Fu and Kane [1] proposed a realistic way to construct effective p-wave conditions with ordinary superconductor, which needs to induce full superconducting gap on non-degenerate Dirac surface states. Recently, we found a new platform (FeTe_0.55Se_0.45 single crystal) supporting pure Majorana-type excitations mimic Fu-Kane Model, which benefit from interband k-space proximity effect and strong correlation of materials. By combining ARPES [2] and STM [3] measurements, we, previously, established topological non-trivial properties and shown strong evidences of existence of MBS on vortex cores. In this talk, we will report temperature and tunneling barrier dependent measurements of MBS in FeTe_0.55Se_0.45, whose behaviors support Mojorana explanations. [1] L. Fu and C. L. Kane, Phys. Rev. Lett. 100, 096407 (2008) [2] P. Zhang et al., arXiv:1706.05163 (2017) [3] D.-F. Wang^*, L.-Y. Kong^*, P. Fan^* et al., arXiv:1706.06074 (2017)