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Quasi-one-dimensional topological band structure and van Hove singularities in monolayer TaIrTe4 from laser μ-ARPES

Publication date2026-08-21
First online date2026-08-21
Abstract

Recent transport experiments reported a quantum spin Hall insulator phase in monolayer 1T-TaIrTe4 gated away from charge neutrality. This phase is not predicted by band structure calculations and has been attributed to an electronic instability induced by strong correlations at a putative van Hove singularity. Here, we investigate the electronic structure of exfoliated monolayer 1T-TaIrTe4 using micro-focus laser angle resolved photoemission. We find a strongly anisotropic band structure susceptible to density wave instabilities. Our data further reveal a saddle point singularity in the density of states. However, we find that the saddle point lies at a density for which transport experiments found no anomalies. Moreover, the quasiparticle line widths suggest weak electron correlations only. This points to a secondary role of van Hove singularities and electron correlations in the transport phase diagram of monolayer 1T-TaIrTe4.

Citation (ISO format)
BOBAN, Honey et al. Quasi-one-dimensional topological band structure and van Hove singularities in monolayer TaIrTe4 from laser μ-ARPES. 2026.
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Creation21/09/2026 12:39:45
First validation23/09/2026 11:24:21
Update23/09/2026 11:24:21
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