Preferential out-of-plane conduction and quasi-one-dimensional electronic states in layered van der Waals material 1T-TaS2
| Autor: | Martino, Edoardo, Pisoni, Andrea, Ćirić, Luka, Arakcheeva, Alla, Berger, Helmuth, Akrap, Ana, Putzke, Carsten, Moll, Philip J. W., Batistić, Ivo, Tutiš, Eduard, Forró, László, Semeniuk, Konstantin |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | npj 2d materials and applications Volume 4 |
| ISSN: | 2397-7132 |
| DOI: | 10.13140/rg.2.2.21190.83525 |
| Popis: | Layered metallic transition-metal dichalcogenides are conventionally seen as two-dimensional conductors, despite a scarcity of systematic studies of the interlayer charge transport conducted in a well- defined geometry. Here, we reveal c-axis-oriented quasi-one-dimensional electronic states in 1T-TaS2, a layered system hosting a plethora of diverse phases, by probing its out-of-plane electrical resistivity using focused-ion-beam-tailored crystals. While the in-plane conduction appears non-metallic due to presence of a unique nanoarray of charge density wave (CDW) domains, the interlayer resistivity has a metallic temperature dependence with the anisotropy close to one, as a result of intertwining of the orbital and CDW orders. The compound is known for what was believed to be a Mott-type localisation below 150 K, yet with our data, supplemented by ab- initio calculations, we interpret the transition as a Peierls-like instability of the quasi-one-dimensional electronic structure. Our findings present a very unintuitive behaviour in a van der Waals crystal. |
| Databáze: | OpenAIRE |
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