Nearly quantized conductance plateau of vortex zero mode in an iron-based superconductor

10 Jan 2020  ·  Zhu Shiyu, Kong Lingyuan, Cao Lu, Chen Hui, Papaj Michal, Du Shixuan, Xing Yuqing, Liu Wenyao, Wang Dongfei, Shen Chengmin, Yang Fazhi, Schneeloch John, Zhong Ruidan, Gu Genda, Fu Liang, Zhang Yu-Yang, Ding Hong, Gao Hong-Jun ·

Majorana zero-modes (MZMs) are spatially-localized zero-energy fractional quasiparticles with non-Abelian braiding statistics that hold a great promise for topological quantum computing. Due to its particle-antiparticle equivalence, an MZM exhibits robust resonant Andreev reflection and 2e2/h quantized conductance at low temperature... By utilizing variable-tunnel-coupled scanning tunneling spectroscopy, we study tunneling conductance of vortex bound states on FeTe0.55Se0.45 superconductors. We report observations of conductance plateaus as a function of tunnel coupling for zero-energy vortex bound states with values close to or even reaching the 2e2/h quantum conductance. In contrast, no such plateau behaviors were observed on either finite energy Caroli-de Genne-Matricon bound states or in the continuum of electronic states outside the superconducting gap. This unique behavior of the zero-mode conductance reaching a plateau strongly supports the existence of MZMs in this iron-based superconductor, which serves as a promising single-material platform for Majorana braiding at a relatively high temperature. read more

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Superconductivity Mesoscale and Nanoscale Physics