Unconventional Superconductivity on a Topological Insulator
Jacob Linder, Yukio Tanaka, Takehito Yokoyama, Asle Sudbø, Naoto Nagaosa
DOI 10.1103/PhysRevLett.104.067001 · Physical Review Letters
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Abstract
We study proximity-induced superconductivity on the surface of a topological insulator (TI), focusing on unconventional pairing. We find that the excitation spectrum becomes gapless for any spin-triplet pairing, such that both subgap bound states and Andreev reflection is strongly suppressed. For spin-singlet pairing, the zero-energy surface state in the dxy-wave case becomes a Majorana fermion, in contrast with the situation realized in the topologically trivial high-Tc cuprates. We also study the influence of a Zeeman field on the surface states. Both the magnitude and direction of this field are shown to strongly influence the transport properties, in contrast with the case without TI. We predict an experimental signature of the Majorana states via conductance spectroscopy.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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