PT - JOURNAL ARTICLE
AU - Kim, Howon
AU - Palacio-Morales, Alexandra
AU - Posske, Thore
AU - Rózsa, Levente
AU - Palotás, Krisztián
AU - Szunyogh, László
AU - Thorwart, Michael
AU - Wiesendanger, Roland
TI - Toward tailoring Majorana bound states in artificially constructed magnetic atom chains on elemental superconductors
DP - 2018 May 01
TA - Science Advances
VI - 4
IP - 5
4099 - http://advances.sciencemag.org/content/4/5/eaar5251.short
4100 - http://advances.sciencemag.org/content/4/5/eaar5251.full
SO - Sci Adv2018 May 01; 4
AB - 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.