2018/08/08 by Anand Kamlapure, L. Cornils, Lasse Cornils +3 · 2 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #MAJORANA #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum computer #Quantum mechanics #Scanning tunneling microscope #Spin (aerodynamics) #Spins #Superconductivity #Topological Materials and Phenomena #cond-mat.supr-con
paper · pdf · doi:10.1038/s41467-018-05701-8
published as Nature Communications 9, 3253 (2018) · 24 pages
openalex publication_date 2018/08/08 · arxiv created 2018/08/14 · arxiv updated 2018/08/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Magnetic atoms on a superconductor give rise to Yu-Shiba-Rusinov (YSR) states within the superconducting energy gap. A spin chain of magnetic adatoms on an s-wave superconductor may lead to topological superconductivity accompanied by the emergence of Majorana modes at the chain ends. For their usage in quantum computation, it is a prerequisite to artificially assemble the chains and control the exchange couplings between the spins in the chain and in the substrate. Here, using a scanning tunneling microscope tip, we demonstrate engineering of the energy levels of the YSR states by placing interstitial Fe atoms in close proximity to adsorbed Fe atoms on an oxidized Ta surface. Based on this prototype platform, we show that the interaction within a long chain can be strengthened by linking the adsorbed Fe atoms with the interstitial ones. Our work adds an important step towards the controlled design and manipulation of Majorana end states.