Reducing disorder in PbTe nanowires for Majorana research
arxiv(2024)
摘要
Material challenges are the key issue in Majorana nanowires where surface
disorder constrains device performance. Here, we tackle this challenge by
embedding PbTe nanowires within a latticematched crystal, an oxide-free
environment. The wire edges are shaped by self-organized growth instead of
lithography, resulting in nearly-atomic-flat facets along both cross-sectional
and longitudinal directions. Quantized conductance plateaus are observed at
zero magnetic field with channel lengths reaching 1.54 μm, significantly
surpassing the state-of-the-art of III-V nanowires (nearly an
order-of-magnitude improvement compared to InSb). Coupling PbTe to a Pb film
unveils a flat interface spanning microns and a large superconducting gap of 1
meV. Our results meet the stringent low-disorder requirement for the definitive
observation of Majoranas.
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