%0 Journal Article
%A Kim, Howon
%A Palacio-Morales, Alexandra
%A Posske, Thore
%A Rózsa, Levente
%A Palotás, Krisztián
%A Szunyogh, László
%A Thorwart, Michael
%A Wiesendanger, Roland
%T Toward tailoring Majorana bound states in artificially constructed magnetic atom chains on elemental superconductors
%D 2018
%R 10.1126/sciadv.aar5251
%J Science Advances
%P eaar5251
%V 4
%N 5
%X Realizing Majorana bound states (MBS) in condensed matter systems is a key challenge on the way toward topological quantum computing. As a promising platform, one-dimensional magnetic chains on conventional superconductors were theoretically predicted to host MBS at the chain ends. We demonstrate a novel approach to design of model-type atomic-scale systems for studying MBS using single-atom manipulation techniques. Our artificially constructed atomic Fe chains on a Re surface exhibit spin spiral states and a remarkable enhancement of the local density of states at zero energy being strongly localized at the chain ends. Moreover, the zero-energy modes at the chain ends are shown to emerge and become stabilized with increasing chain length. Tight-binding model calculations based on parameters obtained from ab initio calculations corroborate that the system resides in the topological phase. Our work opens new pathways to design MBS in atomic-scale hybrid structures as a basis for fault-tolerant topological quantum computing.
%U https://advances.sciencemag.org/content/advances/4/5/eaar5251.full.pdf