RT Journal Article
SR Electronic
T1 Hyperfine interaction of individual atoms on a surface
JF Science
JO Science
FD American Association for the Advancement of Science
SP 336
OP 339
DO 10.1126/science.aat7047
VO 362
IS 6412
A1 Willke, Philip
A1 Bae, Yujeong
A1 Yang, Kai
A1 Lado, Jose L.
A1 Ferrón, Alejandro
A1 Choi, Taeyoung
A1 Ardavan, Arzhang
A1 Fernández-Rossier, Joaquín
A1 Heinrich, Andreas J.
A1 Lutz, Christopher P.
YR 2018
UL http://science.sciencemag.org/content/362/6412/336.abstract
AB The interaction of nuclei with nonzero spin with electron spins creates small electronic energy. With a scanning tunneling microscope tip, Willke et al. measured these hyperfine interactions for iron and titanium atoms that were manipulated on a magnesium oxide surface. The tip was also used to measure electron paramagnetic resonance spectra. The hyperfine structure of single atoms was sensitive to the binding site of the atom as well as its position relative to other magnetic atoms.Science, this issue p. 336Taking advantage of nuclear spins for electronic structure analysis, magnetic resonance imaging, and quantum devices hinges on knowledge and control of the surrounding atomic-scale environment. We measured and manipulated the hyperfine interaction of individual iron and titanium atoms placed on a magnesium oxide surface by using spin-polarized scanning tunneling microscopy in combination with single-atom electron spin resonance. Using atom manipulation to move single atoms, we found that the hyperfine interaction strongly depended on the binding configuration of the atom. We could extract atom- and position-dependent information about the electronic ground state, the state mixing with neighboring atoms, and properties of the nuclear spin. Thus, the hyperfine spectrum becomes a powerful probe of the chemical environment of individual atoms and nanostructures.