A magnetic method to control the transport of chiral Majorana fermions

phys.org | 11/13/2018 | Staff
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The Majorana fermion, a particle that is its own antiparticle, was originally introduced as a putative elementary particle by Ettore Majorana in 1937, and the chiral Majorana fermion was experimentally observed in topological superconductors in 2017. Since the Majorana fermion is a charge-neutral particle, the direct effect on Majorana fermions by electromagnetic methods should fail. Now, researchers have proposed a scheme to control the transport of chiral Majorana edge modes in a ring-shaped Josephson junction of a topological superconductor using magnetic flux.

Exotic excitations with characteristics of Majorana fermions in condensed-matter systems are attracting widespread interest due to their non-Abelian braiding statistics with possible applications in topological quantum computation. Topological superconductors provide a fertile ground supporting these Majorana excitations at their edges and at topological defects. Theoretical proposals show that such an exotic superconductivity can be realized by bringing certain topological matters in proximity to an s-wave superconductor. In 2017, the group led by Prof. Wang at the University of California, Los Angeles, realized the chiral topological superconductor by coupling a quantum anomalous Hall insulator with an s-wave superconductor and observed a half-integer conductance plateau, which provides a likely signature of chiral Majorana fermions.

Application - Majorana - Fermions - Devices - Majorana

To further exploit the practical application of Majorana fermions in realistic devices, it is crucial to control and manipulate Majorana excitations in condensed-matter systems. Considering that the Majorana fermion is a charge-neutral particle, the direct effect on Majorana fermions by electric or magnetic methods should fail. A recent study proposed a magnetic method to control the transport of chiral Majorana fermions in topological superconductors.

The related research paper, titled "Magnetic flux control of chiral Majorana edge modes in topological superconductor," was published in SCIENCE CHINA-Physics, Mechanics & Astronomy, volume 61, 2018....
(Excerpt) Read more at: phys.org
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