The Budapest Quantum Optics Group

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Transport signatures of topological superconducting wires

Jan Dahlhaus

(Lorentz Insitute, Leiden)

Time: Thu Dec 6 14:00:00 2012
Location: Building 1, Room 114, Auditorium

Recent experiments on topological superconducting wires detected first signatures of Majorana fermions in hybrid superconductor-semiconductor heterostructures. These Majorana states are regarded as promising building blocks for a quantum computer. Since transport measurements are the primary tool of identification of these phases, a profound understanding of the processes involved is essential. I will give some background on the transport theory of topological superconductors and then discuss some recent work, both on the zero-bias peak in NS junctions and the 4pi-periodic Josephson effect in SNS junctions.

Related publications:

  • A. R. Akhmerov, J. P. Dahlhaus, F. Hassler, M. Wimmer, and C. W. J. Beenakker: Quantized conductance at the Majorana phase transition in a disordered superconducting wire, Phys.Rev.Lett. 106, 057001 (2011), arXiv:1009.5542
  • M. Wimmer, A. R. Akhmerov, J. P. Dahlhaus, and C. W. J. Beenakker: Quantum point contact as a probe of a topological superconductor, New J. Phys. 13, 053016 (2011), arXiv:1101.5795
  • D. I. Pikulin, J. P. Dahlhaus, M. Wimmer, H. Schomerus, and C. W. J. Beenakker: Zero-voltage conductance peak from weak antilocalization in a Majorana nanowire, arXiv:1206.6687
  • C. W. J. Beenakker, D. I. Pikulin, T. Hyart, H. Schomerus, and J. P. Dahlhaus: Fermion-parity anomaly of the critical supercurrent in the quantum spin-Hall effect, arXiv:1210.5412