
Topological active matter
A Review discusses the properties of topological defects and topological band structures in active media, and an accompanying Comment describes the role of topolgical defects in biological matter.
A Review discusses the properties of topological defects and topological band structures in active media, and an accompanying Comment describes the role of topolgical defects in biological matter.
Understanding the fundamental limits to photonic design is both theoretically important and critical to the development of future high-performance photonic devices. This Review surveys progress made in this area and discusses an emerging general framework for evaluating photonic design limits based on conservation principles and optimization theory.