Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 88: Electronic Structure: Surface Magnetism and Spin Phenomena
O 88.4: Talk
Thursday, March 19, 2015, 15:45–16:00, MA 042
Shot noise as a probe of spin polarized transport through single atoms — •Andreas Burtzlaff1, Alexander Weismann1, Mads Brandbyge2, and Richard Berndt1 — 1IEAP, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany — 2NanoDTU, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
Single Fe and Co adatoms on a Au(111) surface were contacted with a Au coated tip in an STM at 4K. The shot noise of the current through the contacts is strongly suppressed compared to the classical value of 2eI. This is a clear indicator of spin polarization in the electronic transmission. Surprisingly, this effect is observed from single atoms, whose spin moment is expected to fluctuate at 4K. Moreover, Co on Au(111) is a Kondo system and the localized spin is expected to be screened. The results will be discussed on the basis of density functional calculations.