Nonlinear phenomena

Nonlinear phenomena are phenomena, which, in contrast to a linear system, cannot be explained by a mathematical relationship of proportionality (that is, a linear relationship between two variables). For example, the spread of an infectious disease is most often exponential, rather than linear, with time.

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  • News and Views |

    Quantum cascade lasers are bright and compact semiconductor lasers that emit light in the mid- to far-infrared spectral region. The use of a closed ring cavity has now set them on the path towards ultrafast pulses.

    • Johann Riemensberger
    Nature Physics 16, 708-709
  • News and Views |

    Despite the wide use of mode-locked lasers, no general theory for mode-locking exists. An attractor dissection approach provides some intuitive understanding of the complex dynamics in one type of mode-locking.

    • F. Ömer Ilday
    Nature Physics 16, 504-505
  • News and Views |

    Synchronization can induce both order and disorder, betraying a multistability that is rife in living systems. Evidence now suggests that the circadian clock synchronizes with the cell cycle, and that this behaviour is common to different species.

    • Mathias L. Heltberg
    •  & Mogens H. Jensen
    Nature Physics 15, 989-990
  • News and Views |

    Floquet engineering harnesses alternating fields to create a topological band structure in an otherwise ordinary material. These fields drive plasmons that can spontaneously split into chiral circulating modes and induce magnetization.

    • Luis E. F. Foa Torres
    Nature Physics 15, 988-989