ArticleNature communications2025
Observation of momentum-band topology in PT-symmetric Floquet lattices.
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.
- Interface States in Space-Time Photonic Crystals: Topological Origin, Propagation, and Amplification.ACS photonics · 2026Article
- Temporal super-cell engineering and acoustic amplification in dispersive phononic time crystals.Nature communications · 2026Article
- Harmonic non-Hermitian skin effect.Nature communications · 2026Article
- Observation of wave amplification and temporal topological state in a non-synthetic photonic time crystal.Nature communications · 2025Article
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Authors and funding
6 authors.
Funding
Abstract
Momentum-band topology is a groundbreaking concept in multidisciplinary physics. Unlike the conventional energy-band topology, it defines a distinctive band topology within the energy Brillouin zone. Despite revolutionizing the paradigm of topological band theory, both theoretical and experimental studies of this new concept remain in their infancy. Here, we unveil the momentum-band topology in a PT-symmetric Floquet lattice, where the drive-induced momentum gap can be rigorously characterized by a quantized Berry phase. Experimentally, we synthesize the model using an acoustic cavity-tube structure coupled to custom-designed external circuits. By innovatively reconstructing the Floquet operator from measured time-domain wavefunctions, we extract the system's eigenstates and, for the first time, provide direct bulk evidence of momentum-band topology via momentum-band inversion and topological invariants. This is accompanied by a clear observation of time-localized interface states, thus providing a comprehensive examination of the temporal bulk-boundary correspondence. Our work paves the way for further experimental studies on the burgeoning momentum-gap physics.
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