Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 54: Poster Wednesday: 2D Materials 2

O 54.11: Poster

Wednesday, September 7, 2022, 18:00–20:00, P4

Interlayer charge transport anomalies in 1T-TaS2 and 2H-NbS2 — Edoardo Martino, László Forró, and •Konstantin Semeniuk — Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

Layered van der Waals materials, such as transition metal dichalcogenides, have emerged as promising platforms for realising functional materials for practical applications. Tuning interlayer coupling in these systems via twist, intercalation, exfoliation, etc. opens up a vast parameter space for inducing exploitable properties. Probing of the out-of-plane conduction is a useful tool for gauging the subtle interactions between the atomic planes, particularly in bulk crystals of TMDs.

We present comprehensive studies of charge transport anisotropies of bulk 1T-TaS2 and 2H-NbS2. The samples were tailored using focused ion beam in order to ensure homogeneous current flow across the principal crystallographic directions. We find that resistivity anisotropy of 1T-TaS2 is, paradoxically, of the order of unity, with the out-of-plane conduction becoming more preferred at lower temperatures due to a formation of c-axis-oriented quasi-one-dimensional orbital chains. In 2H-NbS2, we observe a pronounced upturn of the out-of-plane resistivity upon cooling. We attribute the anomaly to a unidirectional Kondo scattering, caused by inherent inclusions of 1T-NbS2 layers, which host a lattice of singly occupied orbitals.

[1] E. Martino et al., npj 2D Mater. Appl., 4, 7 (2020).

[1] E. Martino et al., npj 2D Mater. Appl., 5, 86 (2021).