Regensburg 2022 – scientific programme

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O: Fachverband Oberflächenphysik

O 25: Focus Session: Atomic-Scale Characterization of Correlated Ground States in Epitaxial 2D Materials

O 25.4: Topical Talk

Tuesday, September 6, 2022, 11:45–12:15, H2

Charge order in two-dimensional materials — •Erik van Loon — Division of Mathematical Physics, Department of Physics, Lund University

Charge-ordering in two-dimensional materials involves simultaneous changes in the electronic and lattice degrees of freedom. The precise manifestation of the charge-density wave depends sensitively on the experimental conditions [1] (substrate, doping, etc.), and there is some controversy over the mechanism responsible for the ordering. Material-specific theory can help resolve theses questions. Here, we use a theoretical approach called fluctuation diagnostics [2] to disentangle the contributions to the charge-ordering instability. This helps explain the scanning tunnelling spectroscopy experiments on the charge-density waves in TaS2 [1,2] and VS2 [3].

[1] J. Hall et al., ACS Nano 13, 10210 (2019)

[2] J. Berges et al., Phys. Rev. B 101, 155107 (2020)

[3] C. van Efferen et al., Nature Comms 12, 6837 (2021)