Articles in 2022

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  • The transition from a glassy to a liquid phase is normally assumed to take place cooperatively across the whole material. But now, experiments show that, under certain conditions, isolated regions of liquid can form in the glassy matrix first.

    • Ana Vila-Costa
    • Marta Gonzalez-Silveira
    • Javier Rodriguez-Viejo
  • The CMS Collaboration finds evidence for the contribution from off-shell Higgs bosons to the production of events with two Z bosons. This provides a measurement of the Higgs boson’s width.

    • Thomas R. Junk
    News & Views
  • Experiments with small flocks of sheep show intermittent collective motion events driven by random leaders that guide the group. A model reveals information pooling capabilities, suggesting a mechanism for swarm intelligence.

    • Cristián Huepe
    News & Views
  • The spatiotemporal profile of the electric field around a high-energy electron beam was visualized using an ultrafast technique based on electro-optic sampling. By investigating the formation of the Coulomb field it was possible to experimentally confirm the validity of the predictions of special relativity regarding electromagnetic fields.

    Research Briefing
  • Ensembles of weakly interacting atoms have enabled some of the most precise measurements ever made. Now researchers have shown that making these atoms work together in a strongly interacting regime can boost sensitivity by orders of magnitude.

    • Shannon Whitlock
    News & Views
  • An ultracold spinor Bose gas was used to achieve advanced experimental control and detection of an easy-plane ferromagnet, allowing observation of the system as it approaches equilibrium. The measurements revealed twofold superfluidity in the spin and density degrees of freedom with very different critical speeds.

    Research Briefing
  • Many quantum applications require the careful preparation of quantum harmonic oscillators. The combination of a high-power microwave drive and weak nonlinearity enables fast control of such systems, with implications for quantum computing and metrology.

    • Christian Kraglund Andersen
    News & Views
  • Interacting quantum systems near criticality have been proposed as potential probes for quantum metrology. An experiment with Rydberg atoms now proves the enhanced sensitivity of critical many-body systems to small variations in external parameters.

    • Dong-Sheng Ding
    • Zong-Kai Liu
    • Charles S. Adams
  • Making monolayer superconductors creates interesting effects, but often decreases the transition temperature compared to 3D materials. Instead, intercalating molecules into a layered superconductor tailors the superconductivity with fewer trade-offs.

    • Mark T. Edmonds
    News & Views
  • Many-body quantum systems that escape thermalization are promising candidates for quantum information applications. A weak-ergodicity-breaking mechanism—quantum scarring—has now been observed with superconducting qubits in unconstrained models.

    • Pengfei Zhang
    • Hang Dong
    • Ying-Cheng Lai
  • The superconducting critical temperature of monolayer materials is often lower than their bulk counterparts. Now, intercalation is shown to induce two-dimensional superconducting properties while maintaining the bulk critical temperature.

    • Haoxiong Zhang
    • Awabaikeli Rousuli
    • Shuyun Zhou