Superconducting proximity effect and Majorana fermions at the surface of a topological insulator

Authors: Liang Fu, C. L. Kane

Phys. Rev. Lett. 100, 096407 (2008)
arXiv: 0707.1692v3 - DOI (cond-mat.mes-hall)
4 pages, 3 figures, published version
License: not stated (all rights reserved)

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In their study, Liang Fu and C. L. Kane investigate the proximity effect between an s-wave superconductor and the surface states of a strong topological insulator. They find that this interaction results in a two-dimensional state that resembles a spinless p_x+ip_y superconductor while still preserving time reversal symmetry. This unique state supports the existence of Majorana bound states at vortices and linear junctions between superconductors mediated by the topological insulator form a non-chiral one-dimensional wire for Majorana fermions. The authors propose that circuits constructed from these junctions offer a promising method for creating, manipulating, and fusing Majorana bound states. Their findings have significant implications for the development of novel quantum computing platforms and other applications in which robust and fault-tolerant qubits are desired. This research provides valuable insights into the behavior of topological insulators in proximity to superconductors and highlights their potential for hosting exotic quasiparticles such as Majorana fermions.
AI-generated keywords: Majorana fermions Topological insulator Superconductor Proximity effect Quantum computing

AI-generated Key Points

  • Liang Fu and C. L. Kane investigate the proximity effect between an s-wave superconductor and the surface states of a strong topological insulator.
  • The interaction results in a two-dimensional state resembling a spinless p_x+ip_y superconductor while preserving time reversal symmetry.
  • Majorana bound states exist at vortices and linear junctions between superconductors mediated by the topological insulator, forming a non-chiral one-dimensional wire for Majorana fermions.
  • Circuits constructed from these junctions offer a promising method for creating, manipulating, and fusing Majorana bound states.
  • Findings have implications for the development of novel quantum computing platforms and other applications requiring robust and fault-tolerant qubits.
  • Research provides insights into the behavior of topological insulators near superconductors and their potential for hosting exotic quasiparticles like Majorana fermions.
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Abstract: We study the proximity effect between an s-wave superconductor and the surface states of a strong topological insulator. The resulting two dimensional state resembles a spinless p_x+ip_y superconductor, but does not break time reversal symmetry. This state supports Majorana bound states at vortices. We show that linear junctions between superconductors mediated by the topological insulator form a non chiral 1 dimensional wire for Majorana fermions, and that circuits formed from these junctions provide a method for creating, manipulating and fusing Majorana bound states.

Submitted to arXiv on 11 Jul. 2007

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