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Unconventional Superconductivity on a Topological Insulator

Linder, Jacob; Tanaka, Yukio; Yokoyama, Takehito; Sudbø, Asle; Nagaosa, Naoto
Journal article, Peer reviewed
Accepted version
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URI
http://hdl.handle.net/11250/2458603
Date
2010
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  • Publikasjoner fra CRIStin - NTNU [41874]
Original version
Physical Review Letters. 2010, 104 (6), .   10.1103/PhysRevLett.104.067001
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. (Editor's Suggestion)
Publisher
American Physical Society
Journal
Physical Review Letters

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