Wireless majorana fermions: from magnetic tunability to braiding
(Conference Presentation)

Geoffrey L. Fatin; Alex Matos-Abiague; Benedikt Scharf; Igor Zutic

doi:10.1117/12.2238052

4 November 2016 Wireless majorana fermions: from magnetic tunability to braiding (Conference Presentation)

Geoffrey L. Fatin, Alex Matos-Abiague, Benedikt Scharf, Igor Zutic

Proceedings Volume 9931, Spintronics IX; 993146 (2016) https://doi.org/10.1117/12.2238052
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States

Abstract

In condensed-matter systems Majorana bound states (MBSs) are emergent quasiparticles with non-Abelian statistics and particle-antiparticle symmetry. While realizing the non-Abelian braiding statistics under exchange would provide both an ultimate proof for MBS existence and the key element for fault-tolerant topological quantum computing, even theoretical schemes imply a significant complexity to implement such braiding. Frequently examined 1D superconductor/semiconductor wires provide a prototypical example of how to produce MBSs, however braiding statistics are ill-defined in 1D and complex wire networks must be used. By placing an array of magnetic tunnel junctions (MTJs) above a 2D electron gas formed in a semiconductor quantum well grown on the surface of an s-wave superconductor, we have predicted the existence of highly tunable zero-energy MBSs and have proposed a novel scheme by which MBSs could be exchanged [1]. This scheme may then be used to demonstrate the states’ non-Abelian statistics through braiding. The underlying magnetic textures produced by MTJ array provides a pseudo-helical texture which allows for highly-controllable topological phase transitions. By defining a local condition for topological nontriviality which takes into account the local rotation of magnetic texture, effective wire geometries support MBS formation and permit their controlled movement in 2D by altering the shape and orientation of such wires. This scheme then overcomes the requirement for a network of physical wires in order to exchange MBSs, allowing easier manipulation of such states. [1] G. L. Fatin, A. Matos-Abiague, B. Scharf, and I. Zutic, arXiv:1510.08182, preprint.

Conference Presentation

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Geoffrey L. Fatin, Alex Matos-Abiague, Benedikt Scharf, and Igor Zutic "Wireless majorana fermions: from magnetic tunability to braiding (Conference Presentation)", Proc. SPIE 9931, Spintronics IX, 993146 (4 November 2016); https://doi.org/10.1117/12.2238052

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KEYWORDS

Magnetism

Fermions

Magnetic semiconductors

Quantum computing

Quantum wells

Quasiparticles

Semiconductors

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