Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 39: Correlated Electrons: Charge Order
TT 39.9: Talk
Wednesday, March 20, 2024, 11:45–12:00, H 3025
Interlayer coupling between two charge density waves in 4Hb-TaS2 — •Carolina A. Marques1, Berk Zengin1, Aleš Cahlík1, Danyang Liu1, Helmuth Berger2, Ana Akrap3, and Fabian D. Natterer1 — 1Department of Physics, University of Zurich, Switzerland — 2Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, Switzerland — 3Department of Physics, University of Fribourg, Switzerland
The van der Waals material 4Hb-TaS2 is a superlattice of alternating layers with 1H and 1T coordination structures. The charge density waves (CDW) of each individual layer persist within the bulk of the material, and the superconducting temperature is enhanced compared to the pristine 2H-TaS2. Here, we use scanning tunneling microscopy and quasiparticle interference (QPI) to investigate the interaction between adjacent CDWs, and with the superconducting state. We identify a weakly dispersing band from QPI on the 1T surface and find domains with different orientations of the CDW, which change the observed Moiré patterns at the surface and the energy onset of the weakly dispersing band.
Keywords: Scanning tunneling microscopy; Quasiparticle interference; Charge density wave; Tantalum disulfide; Moire pattern