Gapless topological superconductors: Model Hamiltonian and realization
Yuval Baum, Thore Posske, Ion Cosma Fulga, Björn Trauzettel, Ady Stern
DOI 10.1103/PhysRevB.92.045128 · Physical Review B
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Abstract
The existence of an excitation gap in the bulk spectrum is one of the most prominent fingerprints of topological phases of matter. In this paper, we propose a family of two-dimensional Hamiltonians that yield an unusual class D topological superconductor with a gapless bulk spectrum but well-localized Majorana edge states. We perform a numerical analysis for a representative model of this phase and suggest a concrete physical realization by analyzing the effect of magnetic impurities on the surface of a strong topological insulator.
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