Dresden 2026 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 71: 2D Materials: Electronic structure, excitations, etc. – Poster (joint session O/TT)
O 71.4: Poster
Mittwoch, 11. März 2026, 18:00–20:00, P2
Probing defect-induced wave patterns and superconductivity in 2H-NbS2 — Werner M.J. van Weerdenburg, •Margarete Huisinga, Constantin Flommersfeld, Lisa M. Rütten, and Katharina J. Franke — Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
Transition metal dichalcogenides (TMDCs) host a variety of electronic phases, including superconductivity and charge-density-wave (CDW) order. Recent reports on 2H-NbS2 have added a coexisting pair-density-wave (PDW) order to this set, inspiring new questions about the coexistence and driving mechanisms of these phases [1]. In contrast, the closely-related superconducting compound 2H-NbS2 lacks a CDW phase, but has been suggested to be close to a CDW instability and sensitive to the presence of defects [2,3].
Using low-temperature scanning tunneling microscopy and spectroscopy, we probe the electronic, phononic and superconducting properties of 2H-NbS2. We observe wave-like modulations around intrinsic defects in differential-conductance maps and compare them to band-structure calculations. To assess the nature of these modulations, we probe the modulated regions and characterize the superconductivity spatially. These observations add to the ongoing exploration of superconducting, CDW, and PDW phases in TMDC materials.
[1] Liu et al., Science 372,1447-1452 (2021); [2] Heil et al., PRL 119, 087003 (2017); [3] Wen et al., PRB 101:241404, 6 (2020)
Keywords: 2D materials; Transition metal dichalcogenides; Superconductivity; Charge density wave; STM