Monday, April 8, 2013

1304.1685 (Shuo Mi et al.)

Proposal for the detection and braiding of Majorana fermions in a
quantum spin Hall insulator
   [PDF]

Shuo Mi, D. I. Pikulin, M. Wimmer, C. W. J. Beenakker
We show how a quantum dot with a ballistic single-channel point contact to a superconductor can be created by means of a gate electrode at the edge of a quantum spin Hall insulator (such as an InAs/GaSb quantum well). A weak perpendicular magnetic field traps a Majorana zero-mode, so that it can be observed in the gate-voltage-averaged differential conductance as a 4e^2/h zero-bias peak above a (2/3{\pi}^2 - 4)e^2/h background. The one-dimensional edge does not permit the braiding of pairs of Majorana fermions, but this obstacle can be overcome by coupling opposite edges at a constriction, allowing for a demonstration of non-Abelian statistics.
View original: http://arxiv.org/abs/1304.1685

No comments:

Post a Comment