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.

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    • 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.

      • Pengning Chao
      • Benjamin Strekha
      • Alejandro W. Rodriguez
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    • The study of Bose–Einstein condensation in photonic systems has attracted strong interest in a variety of physical platforms, including conventional lasers and optical parametric oscillators, exciton and exciton–polariton gases, and photons in dye-filled cavities and propagating geometries. The focus of this Review is to highlight those universal phenomena that stem from the driven-dissipative, non-equilibrium nature of these systems and affect the static, dynamic, superfluid and coherence properties of the condensate.

      • Jacqueline Bloch
      • Iacopo Carusotto
      • Michiel Wouters
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    • Flat bands enhance the effect of electronic interactions and have emerged as a promising platform for superconductivity. This Review explains the quantum geometric origin of flat-band superconductivity and superfluidity, and discusses its relevance in graphene and ultracold gas moiré systems.

      • Päivi Törmä
      • Sebastiano Peotta
      • Bogdan A. Bernevig
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    • Owing to the growing volumes of data from high-energy physics experiments, modern deep learning methods are playing an increasingly important role in all aspects of data taking and analysis. This Review provides an overview of key developments, with a focus on the search for physics beyond the standard model.

      • Georgia Karagiorgi
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      • David Shih
      Review Article
    • The polarization of the cosmic microwave background (CMB) may shed light on the nature of dark matter and dark energy, and on the origin of all structures in the Universe. Discovering a signature of such new physics in the CMB will require new observational and calibration strategies for future CMB experiments.

      • Eiichiro Komatsu
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  • In the 20th century, Bell Labs was a renowned industrial research lab in the US, known as the birthplace of the transistor and for the discovery of cosmic microwave background radiation. It was also home to a 40-year minority outreach programme that went on to create a generation of Black scientists. What can initiatives today learn from the success of this fellowship?

    • Ankita Anirban
    Feature
  • How did the leopard get its spots? According to Rudyard Kipling’s 1902 children’s story, the leopard’s spots were created by fingerprints of an Ethiopian man. Fifty years later, Alan Turing laid the mathematical foundations of our understanding of leopard spots today.

    • Ankita Anirban
    Research Highlight
  • Twenty years ago, the particle physics community launched Indico, an open-source software package for handling all aspects of meetings. This is brief guide to what Indico can do, and how the wider physics community could benefit from adopting it.

    • Tim Smith
    Comment
  • A paper in Journal of the Royal Society Interface reports the physics of how the structure of part of the ear of wheat contributes to fungal spores being agglomerated by the dew cycle.

    • Zoe Budrikis
    Research Highlight
  • Machine learning is no longer restricted to data analysis and is now increasingly being used in theory, experiment and simulation, that is, all traditional aspects of research. Does this perhaps signal the dawn of a new paradigm?

    Editorial
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