Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 100: Electronic Structure of Surfaces II

O 100.8: Vortrag

Donnerstag, 19. März 2020, 12:15–12:30, REC C 213

Spectroscopic evidence for a charge-density wave in monoclinic TaTe2 — •Sanjoy K Mahatha1, Florian Diekmann2, Sebastian Rohlf2, Matthias Kalläne2,3, and Kai Rossnagel1,2,31Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany — 2Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany — 3Ruprecht-Haensel-Labor, Christian-Albrechts-Universität zu Kiel und Deutsches Elektronen-Synchrotron DESY, 24098 Kiel und 22607 Hamburg, Germany

Layered transition-metal dichalcogenides have been a subject of intense research for the last 40 years or so as they are characterized by a plethora of interesting physical phenomena including the formation of charge-density waves (CDWs). Recently, considerable interest in the electronic properties of transition-metal ditellurides has been sparked by the discoveries of Weyl fermions and extremely large magnetoresistance in WTe2 [1]. Within the ditelluride family, however, one compound, TaTe2, has received very little attention until now. Monoclinic TaTe2 undergoes a first-order structural transition around 170 K [2] that has been suggested to originate from a CDW instability. Yet, spectroscopic signatures of the interplay between the complex lattice distortion and charge-density modulation are still missing. Here, we will give a detailed account of the experimental geometric and electronic structure of this "neglected" material.

[1] M. N. Ali, et al., Nature 514, 205 (2014). [2] J. J. Gao, et al., Phys. Rev. B 98, 224104 (2018).

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