Asle Sudbø

Unconventional superconductivity on a topological insulator.

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 d(xy)-wave case becomes a Majorana fermion, in contrast with the situation realized in the topologically trivial high-T(c) 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.

Anomalous finite size effects on surface states in the topological insulator Bi 2 Se 3

We study how the surface states in the strong topological insulator

Non-steroidal anti-inflammatory drugs and the risk of oral cancer: A nested case-control study

{\text{Bi}}_{2}{\text{Se}}_{3}

Tunneling conductance in s-and d-wave superconductor-graphene junctions : Extended Blonder-Tinkham-Klapwijk formalism

are influenced by finite size effects and compare our results with those recently obtained for two-dimensional topological insulator HgTe. We demonstrate two important distinctions: (i) contrary to HgTe, the surface states in

Interplay between superconductivity and ferromagnetism on a topological insulator

{\text{Bi}}_{2}{\text{Se}}_{3}

Observability of a Projected New State of Matter: a Metallic Superfluid

display a remarkable robustness towards decreasing the width

Pairing symmetry conversion by spin-active interfaces in magnetic normal-metal-superconductor junctions.

L

Supercurrent switch in graphene pi junctions.

down to a few nm thus ensuring that the topological surface states remain intact and (ii) the gapping due to the hybridization of the surface states features an oscillating exponential decay as a function of

Josephson current in graphene: Role of unconventional pairing symmetries

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Field- and temperature-induced topological phase transitions in the three-dimensional N-component London superconductor

in