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Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....

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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

Published on: November 21, 2019

Topological Photonic Alloy.

Tiantao Qu¹, Mudi Wang², Xiaoyu Cheng³

¹State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China.

Physical Review Letters

|June 15, 2024

Summary

This summary is machine-generated.

We introduce photonic alloys, a new class of nonperiodic topological materials. These alloys support chiral edge states with minimal magnetic material, even with local time-reversal symmetry breaking.

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Area of Science:

Condensed Matter Physics
Materials Science
Photonics

Background:

Topological materials exhibit unique edge states protected by topology.
Nonperiodic systems offer novel ways to engineer material properties.
Photonic crystals control light propagation using periodic structures.

Purpose of the Study:

To introduce and experimentally realize photonic alloys as a new class of nonperiodic topological materials.
To investigate the emergence of topological edge states in these alloys.
To characterize the topological properties and symmetry breaking in photonic alloys.

Main Methods:

Fabrication of 2D photonic crystals with a mixture of nonmagnetized and magnetized rods.
Microwave regime experiments to probe material properties.
Characterization of topological states using the winding of reflection phase.

Main Results:

Photonic alloys sustain nonreciprocal chiral edge states at low concentrations of magnetic rods.
Topological behavior in substitutional alloys approaches zero threshold concentration in the thermodynamic limit.
Chiral edge states emerge despite local, not global, time-reversal symmetry breaking.

Conclusions:

Photonic alloys represent a novel disordered topological material.
These materials offer tunable band gaps and opportunities for topological device applications.
The findings challenge conventional understanding of topological phase transitions in disordered systems.