Majorana bound states without vortices in topological superconductors with electrostatic defects

Details Majorana bound states without vortices in topological superconductors with electrostatic defects Majorana bound states without vortices in topological superconductors with electrostatic defects

2010-02-18

arxiv.org/abs/1002.3570v3

Phys.Rev.Lett.105:046803,2010

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 7 figures; the appendices are included as supplemental material in the published version

Scientific paper

10.1103/PhysRevLett.105.046803

Vortices in two-dimensional superconductors with broken time-reversal and spin-rotation symmetry can bind states at zero excitation energy. These socalled Majorana bound states transform a thermal insulator into a thermal metal and may be used to encode topologically protected qubits. We identify an alternative mechanism for the formation of Majorana bound states, akin to the way in which Shockley states are formed on metal surfaces: An atomic-scale electrostatic line defect can have a pair of Majorana bound states at the end points. The Shockley mechanism explains the appearance of a thermal metal in vortex-free lattice models of chiral p-wave superconductors and (unlike the vortex mechanism) is also operative in the topologically trivial phase.

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