Ballistic edge states in Bismuth nanowires revealed by SQUID interferometry

@article{Murani2017BallisticES,
  title={Ballistic edge states in Bismuth nanowires revealed by SQUID interferometry},
  author={Anil Murani and Alik Yu. Kasumov and Shamashis Sengupta and Yu. A. Kasumov and Vladimir T. Volkov and Igor I. Khodos and F. Brisset and Rapha{\"e}lle Delagrange and Alexei D Chepelianskii and Richard Deblock and H. Bouchiat and Sophie Gu{\'e}ron},
  journal={Nature Communications},
  year={2017},
  volume={8}
}
The protection against backscattering provided by topology is a striking property. In two-dimensional insulators, a consequence of this topological protection is the ballistic nature of the one-dimensional helical edge states. One demonstration of ballisticity is the quantized Hall conductance. Here we provide another demonstration of ballistic transport, in the way the edge states carry a supercurrent. The system we have investigated is a micrometre-long monocrystalline bismuth nanowire with… 
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References

SHOWING 1-10 OF 181 REFERENCES
Magnetic field resistant quantum interferences in Josephson junctions based on bismuth nanowires
We investigate proximity-induced superconductivity in micrometer-long bismuth nanowires connected to superconducting electrodes with a high critical field. At low temperature we measure a
Magnetic field resistant quantum interferences in bismuth nanowires based Josephson junctions
We investigate proximity induced superconductivity in micrometer-long bismuth nanowires con- nected to superconducting electrodes with a high critical ?field. At low temperature we measure a
Josephson ϕ0-junction in nanowire quantum dots
The Josephson effect describes supercurrent flowing through a junction connecting two superconducting leads by a thin barrier. This current is driven by a superconducting phase difference ϕ between
Quantum interference of surface states in bismuth nanowires probed by the Aharonov-Bohm oscillatory behavior of the magnetoresistance
We report the observation of a dependence of the low temperature resistance of individual single-crystal bismuth nanowires on the Aharonov-Bohm phase of the magnetic flux threading the wire. 55 and
Topological Josephson phi0-junctions
We study the effect of amagnetic field on the current-phase relation of a topological Josephson junction formed by connecting two superconductors through the helical edge states of a quantum
One-dimensional edge states with giant spin splitting in a bismuth thin film.
TLDR
This work demonstrates the first experimental result that directly determines the purely 1D band structure by performing spin-resolved angle-resolving photoemission spectroscopy of Bi islands on a silicon surface that contains a metallic 1D edge structure with unexpectedly large Rashba-type spin-orbit coupling suggestive of the nontopological nature.
Surface Landau levels and spin states in bismuth (111) ultrathin films
TLDR
The unambiguous determination of the surface-state Landau levels in Bi (111) ultrathin films using scanning tunnelling microscopy under magnetic fields perpendicular to the surface is reported.
Ultimately short ballistic vertical graphene Josephson junctions
TLDR
This work vertically sandwiched a cleaved graphene monoatomic layer as the normal-conducting spacer between superconducting electrodes, and shows the strong Josephson coupling reaching the theoretical limit, the convex-shaped temperature dependence of the Josephson critical current and the exceptionally skewed phase dependence ofthe Josephson current.
Edge-mode superconductivity in a two-dimensional topological insulator.
TLDR
These experiments establish InAs/GaSb as a promising platform for the confinement of Majoranas into localized states, enabling future investigations of non-Abelian statistics and gate-tuning between edge-dominated and bulk-dominated regimes of superconducting transport.
...
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