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TT: Fachverband Tiefe Temperaturen

TT 61: Topology – Poster

TT 61.14: Poster

Mittwoch, 11. März 2026, 15:00–17:00, P4

Further Evidence of a Tomonaga-Luttinger Liquid in the Au/Ge(001) Surface Reconstruction — Nico Kubetschek, •Ulrike Kürpick, Johann Tonhäuser, Till-Jakob Stehling, Marcel Schlesag, and René Matzdorf — University of Kassel, Institute of Physics, Heinrich-Plett-Str. 40, Kassel D-34132, Germany

We investigated the Au/Ge(001) surface reconstruction using scanning tunneling microscopy (STM) and spectroscopy at 77 K and 5 K. Local density of states maps reveal quasi-one-dimensional channels, which are oriented almost perpendicular to the Au-induced nanowires visible in STM topographic images. Spectroscopic analysis shows a characteristic power-law dependence, indicative of Tomonaga-Luttinger liquid behavior [1,2]. An increased power-law exponent is measured when these channels are interrupted by embedded Co-Au-induced nanorods [3]. The results are consistent with the existence of a Tomonaga-Luttinger liquid in a deeper layer of the Au-induced surface reconstruction.
[1] S.-I. Tomonaga, Prog. Theoret. Phys. 5, 544 (1950);
[2] J. Luttinger, J. Math. Phys. 4, 1154(1963).
[3] M. Schlesag et al., Phys. Rev. B 110, 195412 (2024).

Keywords: strongly correlated electrons; Tomonaga-Luttinger liquid; Au/Ge(001); scanning tunnelling microscopy; scanning tunnelling spectroscopy