AI Article Synopsis
- The study simulates non-Hermitian metals using photonic experiments to explore their unique topological properties.
- Researchers implement nonunitary time evolution and interferometric measurements to analyze complex eigenenergies and exceptional lines (ELs) of non-Hermitian Bloch Hamiltonians.
- The focus is on two types of non-Hermitian metals—2D systems with symmetry-protected ELs and 3D systems with symmetry-independent knot-like ELs—highlighting differences in their behavior under symmetry-breaking perturbations.
Article Abstract
We experimentally simulate in a photonic setting non-Hermitian (NH) metals characterized by the topological properties of their nodal band structures. Implementing nonunitary time evolution in reciprocal space followed by interferometric measurements, we probe the complex eigenenergies of the corresponding NH Bloch Hamiltonians, and study in detail the topology of their exceptional lines (ELs), the NH counterpart of nodal lines in Hermitian systems. We focus on two distinct types of NH metals: two-dimensional systems with symmetry-protected ELs, and three-dimensional systems possessing symmetry-independent topological ELs in the form of knots. While both types feature open Fermi surfaces, we experimentally observe their distinctions by analyzing the impact of symmetry-breaking perturbations on the topology of ELs.
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| http://dx.doi.org/10.1103/PhysRevLett.127.026404 | DOI Listing |
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