Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Low Dimensional Systems: Other Topics

TT 19.6: Vortrag

Montag, 16. März 2020, 18:15–18:30, HSZ 103

Preferential out-of-plane conduction and quasi-one-dimensional electronic states in layered van der Waals material 1T-TaS2Edoardo Martino1,2, Andrea Pisoni1, Luka Ćirić1, Alla Arakcheeva1, Helmuth Berger1, Ana Akrap2, Carsten Putzke1, Philip Moll1, Ivo Batistić3, Eduard Tutiš4, László Forró1, and •Konstantin Semeniuk11EPFL, Lausanne, Switzerland — 2University of Fribourg, Fribourg, Switzerland — 3University of Zagreb, Zagreb, Croatia — 4Institute of Physics, Zagreb, Croatia

The prevailing strategy for functionalising layered crystals is manipulating coupling between atomic sheets to create novel exploitable electronic states. The responsible interactions can be sensitively gauged by the interlayer charge transport, which has remained largely unexplored. We conducted an unambiguous study of resistivity anisotropy of 1T-TaS2 — a system known for its plethora of diverse phases and a metal-insulator transition of highly debated origin. We present an unprecedented case of drastically better electronic coherence in the out-of-plane direction than within the planes, resulting in the resistivity anisotropy of the order of 1. In the unique nano-composite phase, the complex aperiodic lattice structure suppresses the in-plane conduction. Simultaneously, the material exhibits a conventional metallicity along the c-axis, predicted to originate from the charge-density-wave-induced formation of quasi-one-dimensional orbital chains. The proposed behaviour favours the band-insulator nature of the low-temperature state of 1T-TaS2, contrary to the long-standing Mott localisation picture.

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