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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-TaS₂ — Edoardo Martino^1,2, Andrea Pisoni¹, Luka Ćirić¹, Alla Arakcheeva¹, Helmuth Berger¹, Ana Akrap², Carsten Putzke¹, Philip Moll¹, Ivo Batistić³, Eduard Tutiš⁴, László Forró¹, and •Konstantin Semeniuk¹ — ¹EPFL, 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.