RT Journal Article
SR Electronic
T1 Toward tailoring Majorana bound states in artificially constructed magnetic atom chains on elemental superconductors
JF Science Advances
JO Sci Adv
FD American Association for the Advancement of Science
DO 10.1126/sciadv.aar5251
VO 4
IS 5
A1 Kim, Howon
A1 Palacio-Morales, Alexandra
A1 Posske, Thore
A1 Rózsa, Levente
A1 Palotás, Krisztián
A1 Szunyogh, László
A1 Thorwart, Michael
A1 Wiesendanger, Roland
YR 2018
UL http://advances.sciencemag.org/content/4/5/eaar5251.abstract
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.