Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 46: Poster Session: Frustrated Magnets, Quantum Magnets, Charge Order and Complex Oxids

TT 46.1: Poster

Mittwoch, 18. März 2020, 15:00–19:00, P2/2OG

Manipulation of charge density waves in transition metal dichalcogenides by strain and adsorbates — •F. Cossu1, I. Di Marco1, and A. Akbari1,21Asia Pacific Center for Theoretical Physics, POSTECH, Pohang, Korea — 2Max Planck POSTECH Center for Complex Phase Materials, POSTECH, Pohang, Korea

Interest in transition metal dichalcogenides (materials consisting of van der Waals bonded layers) has been revived due to relatively recent access to synthesis of few layers, where their characteristic structure may result in massive symmetry breaking, which lead to exotic properties in the electronic structure. Collective phases such as superconductivity and charge density waves (CDW), which may be conventional in the bulk, could in principle become unconventional in single layers. Therefore, understanding the mechanisms of emergence of these electronic phases and how they change upon external fields or doping is of great interest. Since the symmetry of the CDW induces the symmetry of the superconducting gap, it is interesting to investigate instances of symmetry change. In NbSe2, charge density waves are incommensurate and follow a triangular modulation 3×3, in the bulk and in single layers. However, zones where the modulation has a stripe character have been observed in single layers. By means of ab-initio calculations, we investigate the possible scenarios beneath the occurrence of the stripe phase. In addition, adsorption by transition metals induces a hierarchy change and a reduction of the symmetry in CDW; it may be argued that, due to the nature of the adsorbate, spin-orbit effect may dominate the nature of the collective excitations.

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