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25 April 2024

» arxiv » 1904.6124

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Observation of Majorana conductance plateau by scanning tunneling spectroscopy
Shiyu Zhu ; Lingyuan Kong ; Lu Cao ; Hui Chen ; Shixuan Du ; Yuqing Xing ; Wenyao Liu ; Dongfei Wang ; Chengmin Shen ; Fazhi Yang ; John Schneeloch ; Ruidan Zhong ; Genda Gu ; Liang Fu ; Yu-Yang Zhang ; Hong Ding ; Hong-Jun Gao ;
Date:	12 Apr 2019
Abstract:	Majorana zero-modes (MZMs) are spatially-localized zero-energy fractional quasiparticles with non-Abelian braiding statistics that hold great promise for topological quantum computing. Due to its particle-antiparticle equivalence, an MZM exhibits perfect Andreev reflection and quantized conductance plateau at 2e2/h at low temperature. Here we report an observation of the Majorana conductance plateau in vortices on the iron superconductor FeTe0.55Se0.45 surface by using scanning tunneling spectroscopy. We found that both extrinsic instrumental convoluted broadening and intrinsic quasiparticle poisoning can reduce the conductance plateau value. When extrinsic instrumental broadening is removed by deconvolution, the plateau is found to nearly reach a 2e2/h quantized value. The direct observation of a conductance plateau on a single zero-mode in a vortex strongly supports the existence and protection of MZMs in this iron-based superconductor, which can serve as a single-material platform for Majorana braiding at relatively high temperature.
Source:	arXiv, 1904.6124
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