ArticleNature communications2025
Non-Hermitian Dirac cones with valley-dependent lifetimes.
Article in Nature communications, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Extreme-bandwidth valley photonic metamaterials approaching Dirac velocity.Nature communications · 2026Article
- Beyond the Non-Hermitian Skin Effect: Scaling-Controlled Topology from Exceptional-Bound Bands.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2026Article
- Lossy phononic metamaterials for valley nonreciprocity.Nature communications · 2026Article
- Ultrasensitive Quantum Sensors Based on High-Order Exceptional Bound States.Research (Washington, D.C.) · 2026Article
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Authors and funding
10 authors.
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No grant is acknowledged in the PubMed record.
Abstract
Relativistic quasiparticles emerging from band degeneracies in crystals play crucial roles in the transport and topological properties of materials and metamaterials. Quasiparticles are commonly described by Hermitian Hamiltonians, with non-Hermiticity usually considered detrimental. In this work, we show that such an assumption of Hermiticity can be lifted to bring quasiparticles into non-Hermitian regime. We propose a concrete lattice model containing two Dirac cones with valley-dependent lifetimes. The lifetime contrast enables an ultra-strong valley selection rule: only one valley can survive in the long-time limit regardless of the excitation, lattice shape and other details. This property leads to an effective parity anomaly with a single Dirac cone and offers a simple way to generate vortex states. Additionally, extending non-Hermitian features to boundaries generates valley kink states with valley-locked lifetimes, making them effectively unidirectional and more resistant against inter-valley scattering. All these phenomena are experimentally demonstrated in a non-Hermitian electric circuit lattice.
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