Year: 2026
Type: preprint
Abstract: Ab initio calculations and angle-resolved photoemission experiments show that the bulk and surface electronic structure of Weyl semimetal candidate MoTe$_2$ changes significantly by tuning the chemical potential by less than 0.4 eV. Calculations show that several Lifshitz transitions can occur among multiple electron and hole Fermi pockets of differing orbital character. Experiments show that 18% Nb-Mo substitution reduces the occupation of bulk and (001) surface bands, effectively producing a chemical potential shift of $\approx 0.3$ eV. Orbital character and dimensionality of the bulk bands is examined by soft X-ray angle resolved photoemission with control of the excitation light polarization. The band filling at the surface is shown to increase upon deposition of alkali atoms. The results indicate that multiple regimes of electronic properties can be easily accessed in this versatile, layered material.
Source: arXiv (Cornell University)
Institutions: Institute of Photonic Sciences, Donostia International Physics Center, Luxembourg Institute of Science and Technology, Forschungszentrum Jülich, Consejo Superior de Investigaciones Científicas, University of the Basque Country, Material Physics Center, École Polytechnique Fédérale de Lausanne, Wuhan University, Wuhan Institute of Quantum Technology, Paul Scherrer Institute, Ikerbasque
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7120138778
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