Lee, Shu-Ping and Alicea, Jason and Refael, Gil (2012) Electrical Manipulation of Majorana Fermions in an Interdigitated Superconductor-Ferromagnet Device. Physical Review Letters, 109 (12). Art. No. 126403. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:20121101-101619309
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We show that a topological phase supporting Majorana fermions can form in a two-dimensional electron gas (2DEG) adjacent to an interdigitated superconductor-ferromagnet structure. An advantage of this setup is that the 2DEG can induce the required Zeeman splitting and superconductivity from a single interface, allowing one to utilize a wide class of 2DEGs including the surface states of bulk InAs. We demonstrate that the interdigitated device supports a robust topological phase when the finger spacing λ is smaller than half of the Fermi wavelength λ_F. In this regime, the electrons effectively see a “smeared” Zeeman splitting and pairing field despite the interdigitation. The topological phase survives even in the opposite limit λ>λ_F/2, although with a reduced bulk gap. We describe how to electrically generate a vortex in this setup to trap a Majorana mode, and predict an anomalous Fraunhofer pattern that provides a sharp signature of chiral Majorana edge states.
|Additional Information:||© 2012 American Physical Society. Received 4 June 2012; published 18 September 2012. We are indebted to Charles M. Marcus for proposing the interdigitated structure studied here, and to Julia Meyer for discussions on the Fraunhofer pattern. We also thank E. Grosfeld, K. T. Law, J. Eisenstein, P. T. Bhattacharjee, S. Iyer, and D. Nandi for illuminating discussions. We are grateful to the Packard Foundation (G. R.), the Humboldt Foundation. and the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation. J. A. gratefully acknowledges funding from the National Science Foundation through Grant No. DMR-1055522 and the Alfred P. Sloan Foundation.|
|Classification Code:||PACS: 71.10.Pm, 03.67.Lx, 74.45.+c|
|Official Citation:||Lee, S.-P., J. Alicea, et al. (2012). "Electrical Manipulation of Majorana Fermions in an Interdigitated Superconductor-Ferromagnet Device." Physical Review Letters 109(12): 126403.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||05 Nov 2012 22:05|
|Last Modified:||27 Dec 2012 02:57|
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