(De)confinement of supercurrent in Z_2 Topological Insulators

Details (De)confinement of supercurrent in Z_2 Topological Insulators (De)confinement of supercurrent in Z_2 Topological Insulators

2009-05-14

arxiv.org/abs/0905.2296v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Reference [14] is added. Typos are corrected. Title is changed

Scientific paper

It is shown that the electric supercurrent flows in a Z_2 topological insulator with U_em(1) X U_z(1) (electromagnetic and spin) gauge symmetries. When U_z(1) is broken, a dissipationless electric current is still possible to flow locally but net charge transfer is absent, i.e., current is confined. In the Kane-Mele model for graphene, this confining-deconfining (superconducting) transition is driven by the Rashba spin-orbit interaction, which breaks U_z(1).

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