Helical Dirac-Majorana interferometer in a superconductor-topological insulator sandwich structure

Details Helical Dirac-Majorana interferometer in a superconductor-topological insulator sandwich structure Helical Dirac-Majorana interferometer in a superconductor-topological insulator sandwich structure

2011-03-17

arxiv.org/abs/1103.3425v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures, v2: modified Fig.2

Scientific paper

In the heterostructure composed of a topological insulator sandwiched by two s-wave superconductors, the time reversal invariant topological superconducting phase, possessing helical Majorana edge modes, is found to exist when the two s-wave superconductors form a Josephson junction with a pi phase shift. Based on such a heterostructure, a helical Dirac-Majorana interferometer is proposed to directly measure a unique transport signature of the helical Majorana modes. Furthermore, we envision how our proposal can be realized on the basis of existing materials such as Bi2Se3 or Bi2Te3 thin films.

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