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O: Fachverband Oberflächenphysik

O 93: Scanning Probe Techniques: Method Development

O 93.3: Talk

Thursday, March 21, 2024, 15:30–15:45, MA 043

Spin-Polarized Transport at the Atomic Limit — •Markus Leisegang, Patrick Härtl, Jens Kügel, and Matthias Bode — Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, 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. In order to get real space access to charge carrier transport at distances of the mean free path and thus in the ballistic regime, we developed and established the molecular nanoprobe (MONA) technique [1,2].

Hereby, we use a single molecule as a detector for charge carriers, which are injected into the substrate under investigation by the STM tip a few nanometers away from the molecule. The high spatial resolution of MONA combined with the small size of the molecular detector allows for transport paths which can be controlled at the atomic level. In a very recent experiment, we merged the MONA technique with spin-polarized STM to SP-MONA. By using the Rashba-split surface state of the BiAg₂ surface as a test sample, we proof that this technique allows to detect spin-polarized transport at the atomic limit [3].
[1] J. Kügel et al., Nano Lett. 17, 5106 (2017)
[2] M. Leisegang et al., Nano Lett. 18, 2165–2171 (2018)
[3] P. Härtl et al., arXiv:2303.00393 (2023)

Keywords: spin polarized; transport; molecular nanoprobe; Rashba; SP-STM