Signatures of Majorana Fermions in Hybrid Superconductor-Semiconductor Nanowire Devices

@article{Mourik2012SignaturesOM,
  title={Signatures of Majorana Fermions in Hybrid Superconductor-Semiconductor Nanowire Devices},
  author={Vincent Mourik and Kun Zuo and Sergey M. Frolov and S{\'e}bastien R. Plissard and Erik P.A.M. Bakkers and Leo P Kouwenhoven},
  journal={Science},
  year={2012},
  volume={336},
  pages={1003 - 1007}
}
Majoranas Arrive When a negatively charged electron meets a positron—its positively charged antiparticle—they annihilate each other in a flash of gamma rays. A Majorana fermion, on the other hand, is a neutral particle, which is its own antiparticle. No sightings of a Majorana have been reported in the elementary particle world, but recently they have been proposed to exist in solid-state systems and suggested to be of interest as a quantum computing platform. Mourik et al. (p. 1003, published… 

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References

SHOWING 1-10 OF 71 REFERENCES

Search for Majorana Fermions in Superconductors

Majorana fermions (particles that are their own antiparticle) may or may not exist in nature as elementary building blocks, but in condensed matter they can be constructed out of electron and hole

Majorana fermions in a tunable semiconductor device

The experimental realization of Majorana fermions presents an important problem due to their non-Abelian nature and potential exploitation for topological quantum computation. Very recently Sau et

New directions in the pursuit of Majorana fermions in solid state systems

  • J. Alicea
  • Physics
    Reports on progress in physics. Physical Society
  • 2012
This review paper highlights recent advances in the condensed matter search for Majorana that have led many in the field to believe that this quest may soon bear fruit and discusses the most remarkable properties of condensed matter Majorana fermions-the non-Abelian exchange statistics that they generate and their associated potential for quantum computation.

Majorana Fermions in Semiconductor Nanowires

We study multiband semiconducting nanowires proximity coupled with an $s$-wave superconductor and calculate the topological phase diagram as a function of the chemical potential and magnetic field.

Majorana fermions and a topological phase transition in semiconductor-superconductor heterostructures.

The measurement of the supercurrent through the junction allows one to discern topologically distinct phases and observe a topological phase transition by simply changing the in-plane magnetic field or the gate voltage, which will be a direct demonstration of the existence of Majorana particles.

Spin-resolved Andreev levels and parity crossings in hybrid superconductor-semiconductor nanostructures.

A direct measurement of the Zeeman effect on the Andreev levels of a semiconductor quantum dot with large electron g-factor, strongly coupled to a conventional superconductor with a large critical magnetic field allows spin degeneracy to be lifted without destroying superconductivity.

Unpaired Majorana fermions in quantum wires

Certain one-dimensional Fermi systems have an energy gap in the bulk spectrum while boundary states are described by one Majorana operator per boundary point. A finite system of length L possesses

Unpaired Majorana fermions in quantum wires

Certain one-dimensional Fermi systems have an energy gap in the bulk spectrum while boundary states are described by one Majorana operator per boundary point. A finite system of length L possesses

Towards a realistic transport modeling in a superconducting nanowire with Majorana fermions

Motivated by recent experiments searching for Majorana fermions (MFs) in hybrid semiconducting-superconducting nanostructures, we consider a realistic tight-binding model and analyze its transport

Parity independence of the zero-bias conductance peak in a nanowire based topological superconductor-quantum dot hybrid device

It is found that the zero-bias conductance peak is present in many consecutive Coulomb diamonds, irrespective of the even-odd parity of the quasi-particle occupation number in the quantum dot.
...