Majorana fermions in ferromagnetic chains on the surface of bulk spin-orbit coupled s-wave superconductors

dc.contributor.authorHui, Hoi-Yin
dc.contributor.authorBrydon, P. M. R.
dc.contributor.authorSau, Jay D.
dc.contributor.authorTewari, S.
dc.contributor.authorSarma, S. Das
dc.date.accessioned2017-08-29T17:43:31Z
dc.date.available2017-08-29T17:43:31Z
dc.date.issued2015-03-06
dc.descriptionFunding for Open Access provided by the UMD Libraries Open Access Publishing Fund.
dc.description.abstractMajorana fermion (MF) excitations in solid state system have non-Abelian statistics which is essential for topological quantum computation. Previous proposals to realize MF, however, generally requires fine-tuning of parameters. Here we explore a platform which avoids the fine-tuning problem, namely a ferromagnetic chain deposited on the surface of a spin-orbit coupled s-wave superconductor. We show that it generically supports zero-energy topological MF excitations near the two ends of the chain with minimal fine-tuning. Depending on the strength of the ferromagnetic moment in the chain, the number of MFs at each end, n, can be either one or two, and should be revealed by a robust zero-bias peak (ZBP) of height 2 ne2/h in scanning tunneling microscopy (STM) measurements which would show strong (weak) signals at the ends (middle) of the chain. The role of an approximate chiral symmetry which gives an integer topological invariant to the system is discussed.en_US
dc.identifierhttps://doi.org/10.13016/M2930NV5Z
dc.identifier.citationScientific Reports, 5 : 8880, doi: 10.1038/srep08880en_US
dc.identifier.urihttp://hdl.handle.net/1903/19657
dc.language.isoen_USen_US
dc.publisherNature Publishing Groupen_US
dc.relation.isAvailableAtCollege of Computer, Mathematical & Natural Sciencesen_us
dc.relation.isAvailableAtPhysicsen_us
dc.relation.isAvailableAtDigital Repository at the University of Marylanden_us
dc.relation.isAvailableAtUniversity of Maryland (College Park, MD)en_us
dc.titleMajorana fermions in ferromagnetic chains on the surface of bulk spin-orbit coupled s-wave superconductorsen_US
dc.typeArticleen_US

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