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Simulating Exceptional Non-Hermitian Metals with Single-Photon Interferometry.

Kunkun Wang^1,2, Lei Xiao¹, Jan Carl Budich³

¹Beijing Computational Science Research Center, Beijing 100084, China.

Physical Review Letters

|July 23, 2021

Summary

This summary is machine-generated.

We experimentally simulate non-Hermitian (NH) metals using photonics to study topological properties. Researchers analyzed exceptional lines (ELs) in 2D and 3D systems, revealing distinctions under symmetry-breaking perturbations.

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Area of Science:

Condensed Matter Physics
Quantum Physics
Photonic Systems

Background:

Non-Hermitian (NH) systems exhibit unique topological properties distinct from Hermitian systems.
Nodal band structures and their topological features are crucial for understanding material properties.
Exceptional lines (ELs) are the non-Hermitian analogs of nodal lines.

Purpose of the Study:

To experimentally simulate and characterize non-Hermitian (NH) metals in a photonic setting.
To investigate the topological properties of exceptional lines (ELs) in both 2D and 3D NH systems.
To differentiate between symmetry-protected and symmetry-independent topological ELs and their behavior under perturbations.

Main Methods:

Utilizing a photonic simulation to implement nonunitary time evolution in reciprocal space.
Employing interferometric measurements to probe complex eigenenergies of NH Bloch Hamiltonians.
Analyzing the impact of symmetry-breaking perturbations on the topology of ELs.

Main Results:

Experimental simulation of NH metals with topological nodal band structures.
Detailed study of the topology of exceptional lines (ELs) in 2D and 3D systems.
Observation of distinct behaviors of symmetry-protected (2D) and symmetry-independent (3D) topological ELs under perturbations.

Conclusions:

The study successfully demonstrates the experimental simulation of NH metals and their topological features in photonics.
Distinctions between different types of topological ELs in NH systems were experimentally observed.
The findings provide insights into the robustness and characteristics of topological phases in non-Hermitian systems.