Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 71: Focus Session: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy 2

O 71.10: Vortrag

Donnerstag, 8. September 2022, 17:45–18:00, S051

Transport in the Rashba-split surface state of (√3× √3)Bi/Ag(111)R30^∘ revealed by MONA — •Markus Leisegang, Patrick Härtl, and Matthias Bode — Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

Transport measurements that are sensitive to the band structure of a material require techniques that operate on the length scale of the charge carrier’s mean free path. A novel method that fulfills this requirement is the molecular nanoprobe (MONA), which uses a single molecule to detect charge carriers [1].

In this study, we investigate the rotation and tautomerization of phthalocyanine molecules on the (√3× √3)Bi/Ag(111)R30^∘ surface and utilize these excitations to investigate transport in the Rashba-split surface state characteristic for this surface [2]. We find that both excitation processes are driven by the N-H stretching mode and can be triggered by a single electron [3]. Our transport measurements proof the sensitivity to hot charge carriers which preferably propagate in the Rashba-split surface state of the BiAg₂ alloy. The expected impact of the spin–momentum-locking of this Rashba-split surface state on the surface transport is discussed and first experimental results obtained with spin-polarized tips will be presented.
[1] M. Leisegang et al., Nano Lett. 18, 2165–2171 (2018)
[2] C. R. Ast et al., Phys. Rev. Lett. 98, 186807 (2007)
[3] J. Kügel et al., Journ. Phys. Chem. C 121, 28204–28210 (2017)