Preferential out-of-plane conduction and quasi-one-dimensional electronic states in layered 1T-TaS2

Abstract

Layered transition metal dichalcogenides (TMDs) are commonly classified as quasi-two-dimensional materials, meaning that their electronic structure closely resembles that of an individual layer, which results in resistivity anisotropies reaching thousands. Here, we show that this rule does not hold for 1T-TaS2 - a compound with the richest phase diagram among TMDs. While the onset of charge density wave order makes the in-plane conduction non-metallic, we reveal that the out-of-plane charge transport is metallic and the resistivity anisotropy is close to one. We support our findings with ab-initio calculations predicting a pronounced quasi-one-dimensional character of the electronic structure. Consequently, we interpret the highly debated metal-insulator transition in 1T-TaS2 as a quasi-one-dimensional instability, contrary to the long-standing Mott localisation picture. In a broader context, these findings are relevant for the newly born field of van der Waals heterostructures, where tuning interlayer interactions (e.g. by twist, strain, intercalation, etc.) leads to new emergent phenomena.

arXiv comment41 page including supplementary information, 5 main figures, 13 supplementary figures. To be published in npj 2D Materials and Applications

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Cited by in corpus (22)

• Band insulator to Mott insulator transition in 1T-TaS${}_2$
• Direct identification of Mott Hubbard band pattern beyond charge density wave superlattice in monolayer 1T-NbSe2
• Observation of a uniaxial strain-induced phase transition in the 2D topological semimetal IrTe${}_2$
• Charge density wave instability and pressure-induced superconductivity in bulk 1T-NbS2
• Identification of the Mott insulating CDW state in 1T-TaS${}_2$
• Out-of-plane transport of 1T-TaS2/graphene-based van der Waals heterostructures
• van der Waals heterostructures based on atomically-thin superconductors
• Spin-orbit and exchange proximity couplings in graphene/1T-TaS${}_2$ heterostructure triggered by a charge density wave
• Stacking effect and Coulomb correlation in layered charge density wave phase of 1T-NbS2
• Probing quantum spin liquids with a quantum twisting microscope
• Modified interlayer stacking and insulator to correlated-metal transition driven by uniaxial strain in 1$T$-TaS${}_2$
• Unidirectional Kondo scattering in layered NbS2
• Probing charge density wave phases and the Mott transition in $1T$-TaS${}_2$ by inelastic light scattering
• Charge density wave surface reconstruction in a van der Waals layered material
• Understanding the flat band in 1T-TaS2 using a rotated basis
• Intra-chain collinear magnetism and inter-chain magnetic phases in Cr3As3-K-based materials
• Thermal Purcell effect and cavity-induced renormalization of dissipations
• Interlayer Hopping between Surface Mott Insulator and Bulk Band Insulator in layered 1T-TaS_{2}
• Quantum Phases and Spin Liquid Properties of 1T-TaS2
• Topical review: the nature of the ground state and possibility of a quantum spin liquid in 1T metal dichalcogenides
• Comment on "Identification of the Mott Insulating Charge Density Wave State in $1T$-TaS${}_2$"
• Impact of the out-of-plane conductivity on spin transport evaluation in a van der Waals material