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Atomic line defects and zero-energy end states in monolayer Fe(Te,Se) high-temperature superconductors | | Cheng Chen
; Kun Jiang
; Yi Zhang
; Chaofei Liu
; Yi Liu
; Ziqiang Wang
; Jian Wang
; | | Date: |
10 Mar 2020 | | Abstract: | Majorana zero-energy bound states (ZEBSs) have been proposed to exist at the
ends of one-dimensional Rashba nanowires proximity-coupled to an s-wave
superconductor in an external magnetic field induced Zeeman field. Such hybrid
structures have been a central platform in the search for non-Abelian Majorana
zero modes (MZMs) toward fault-tolerant topological quantum computing. Here we
report the discovery of ZEBSs simultaneously appearing at each end of a
one-dimensional atomic line defect in monolayer iron-based high-temperature
superconductor FeTe0.5Se0.5 films grown on SrTiO3(001) substrates. The
spectroscopic properties of the ZEBSs, including the temperature and tunneling
barrier dependences, as well as their fusion induced by coupling on line
defects of different lengths are found to be robust and consistent with those
of the MZMs. These observations suggest a realization of topological Shockley
defects at the ends of an atomic line defect in a two-dimensional s-wave
superconductor that can host a Kramers pair of MZMs protected by time-reversal
symmetry along the chain. Our findings reveal an unprecedented class of
topological line defect excitations in two-dimensional superconductor
FeTe0.5Se0.5 monolayer films and offer an advantageous platform for generating
topological zero-energy excitations at higher operating temperatures, in a
single material, and under zero external magnetic field. | | Source: | arXiv, 2003.4539 | | Services: | Forum | Review | PDF | Favorites | |
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