Electrically detected interferometry of Majorana fermions in a topological insulator

Details Electrically detected interferometry of Majorana fermions in a topological insulator Electrically detected interferometry of Majorana fermions in a topological insulator

2009-03-12

arxiv.org/abs/0903.2196v1

Phys. Rev. Lett. 102, 216404 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.102.216404

We show how a chiral Dirac fermion (a massless electron or hole) can be converted into a pair of neutral chiral Majorana fermions (a particle equal to its own antiparticle). These two types of fermions exist on the metallic surface of a topological insulator, respectively, at a magnetic domain wall and at a magnet-superconductor interface. Interferometry of Majorana fermions is a key operation in topological quantum computation, but the detection is problematic since these particles have no charge. The Dirac-Majorana converter enables electrical detection of the interferometric signal.

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