Thickness dependent electronic structure in WTe${}_2$ thin films

Abstract

We study the electronic structure of WTe${}_2$ thin film fakes with different thickness down to 11 nm. Angle-dependent quantum oscillations reveal a crossover from a three-dimensional (3D) to a two-dimensional (2D) electronic system when the sample thickness is reduced below 26 nm. The quantum oscillations further show that the Fermi pockets get smaller as the samples are made thinner, indicating that the overlap between conduction and valence bands is getting smaller and implying the spatial confinement could lift the overlap in even thinner samples. In addition, the quadratic magnetoresistance (MR) also shows a crossover from 3D to 2D behavior as the samples are made thinner, while gating is shown to affect both the quadratic MR and the quantum oscillations of a thin sample by tuning its carrier density.

arXiv comment10 pages, 7 figures, supplementary material included

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• Tunable plasmons in large area WTe2 thin films
• Thickness Dependence of Magneto-transport Properties in Tungsten Ditelluride
• Transparent Josephson Junctions in Higher-Order Topological Insulator WTe2 via Pd Diffusion
• Disorder-induced coupling of Weyl nodes in WTe${}_2$
• The out-of-plane magnetoresistance in a Van der Waals thin film of WTe2
• Modulation of crystal and electronic structures in topological insulators by rare-earth doping