Exponential Protection of Zero Modes in Majorana Islands

  • Willett R
  • Pfeiffer L
  • West K
 et al. 
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Abstract

Majorana fermions are particles identical to their own antiparticles. They have been theoretically predicted to exist in topological superconductors. Here, we report electrical measurements on indium antimonide nanowires contacted with one normal (gold) and one superconducting (niobium titanium nitride) electrode. Gate voltages vary electron density and define a tunnel barrier between normal and superconducting contacts. In the presence of magnetic fields on the order of 100 millitesla, we observe bound, midgap states at zero bias voltage. These bound states remain fixed to zero bias, even when magnetic fields and gate voltages are changed over considerable ranges. Our observations support the hypothesis of Majorana fermions in nanowires coupled to superconductors.

Author-supplied keywords

  • 057201
  • 10
  • 1088
  • 1674-1056
  • 23
  • 5
  • 63
  • 72
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  • 85
  • Condensed Matter - Mesoscale and Nanoscale Physics
  • Condensed Matter - Superconductivity
  • Neutral mode
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  • axial heterostructure
  • b
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  • bohm interferometer
  • coulomb blockade
  • d
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  • emiconductor heterostructures have revolutionized
  • engineering
  • fk
  • fractional quantum Hall effect
  • indium antimonide
  • is equivalent to the
  • majorana fermion
  • midgap states
  • non-abelian anyons
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  • resonant tunneling through a
  • semiconductor nanowire
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  • state physics by providing
  • strain mapping
  • the motion of electrons
  • the opportunity to manipulate
  • topological insulators
  • topological superconductors
  • topological zero modes
  • tunnel barrier

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Authors

  • R L Willett

  • L N Pfeiffer

  • K W West

  • Jason Alicea

  • Sumanta Tewari

  • Tudor D Stanescu

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