Regensburg 2025 – scientific programme

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O: Fachverband Oberflächenphysik

O 86: Electronic Structure of Surfaces: Spectroscopy, Surface States II

O 86.6: Talk

Thursday, March 20, 2025, 16:15–16:30, H2

Origin of the Spin-Polarized Fermi Surface of a Tl Bilayer on Ag(111) — •Sven Schemmelmann¹, Yuichiro Toichi², Peter Krüger³, Kazuyuki Sakamoto², and Markus Donath¹ — ¹Physikalisches Institut, Universität Münster, Germany — ²Department of Applied Physics, Osaka University, Japan — ³Institut für Festkörpertheorie, Universität Münster, Germany

ARPES measurements have shown that the Fermi surface of a Tl bilayer grown on Ag(111) exhibits two hexagonal-shaped states [1]. While the inner one is fully spin polarized, the outer one appears to be unpolarized. Spin-resolved inverse photoemission experiments of the unoccupied states reveal the origin of this peculiar behavior. We observe two downward dispersing states which are both spin split. The two spin branches of the one state are responsible for the two states observed forming the Fermi surface. Interestingly, the spin up branch coincides with the spin down branch of the other downward dispersing state. This is the reason why this state appears to be unpolarized.

[1] T. Kobayashi et al., Nano Lett. 23, 7675 (2023)

Keywords: Electronic structure; Inverse photoemission; Fermi surface