Terahertz optics articles within Nature Physics

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  • News & Views |

    Excitation of magnons — quanta of spin-waves — in an antiferromagnet can be used for high-speed data processing. The addition and subtraction of two such modes opens up possibilities for magnon-based information transfer in the terahertz spectral region.

    • Brijesh Singh Mehra
    •  & Dhanvir Singh Rana

  • Article |

    Inducing coherent interactions between distinct magnon modes—collective excitations of magnetic order—has been challenging. A canted antiferromagnet has demonstrated coherent magnon upconversion induced by terahertz laser pulses.

    • Zhuquan Zhang
    • , Frank Y. Gao
    •  & Keith A. Nelson

  • News & Views |

    Understanding the mechanism underlying light-induced superconductivity could help manifest it at higher temperatures. Experiments now show that the excitation of a specific phonon leads to a resonant enhancement of this effect in K3C60.

    • Jingdi Zhang

  • Article |

    Hole and particle-like quasiparticles of a Mott insulator can pair into excitonic bound states. Now, time-resolved measurements of Sr2IrO4 show signs of an excitonic fluid forming from a photo-excited population of quasiparticles.

    • Omar Mehio
    • , Xinwei Li
    •  & David Hsieh

  • Article
    | Open Access

    Multidimensional coherent spectroscopy measurements in iron-based superconductors demonstrate how the coupling between a superconductor and strong light pulses can drive the transition into a non-equilibrium superconducting state with distinct collective modes.

    • L. Luo
    • , M. Mootz
    •  & J. Wang

  • Research Briefing |

    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.

  • Article
    | Open Access

    The charge transport mechanism in MXenes—an emerging class of layered materials—is not yet fully understood. A combination of terahertz spectroscopy and transport measurements shows that the formation of large polarons play a crucial role.

    • Wenhao Zheng
    • , Boya Sun
    •  & Mischa Bonn

  • Perspective |

    The interaction between light and the crystal lattice of a quantum material can modify its properties. Utilizing nonlinear interactions allows this to be done in a controlled way to design specific non-equilibrium functionalities.

    • Ankit S. Disa
    • , Tobia F. Nova
    •  & Andrea Cavalleri

  • Article |

    Spin currents are generated from an antiferromagnet/heavy-metal heterostructure using optical excitation on picosecond timescales. This will have applications in antiferromagnetic spintronics.

    • Hongsong Qiu
    • , Lifan Zhou
    •  & Peiheng Wu

  • Article |

    A general theoretical picture regarding the generation and the detection of extremely short pulses of squeezed vacuum light is provided, allowing the treatment of arbitrary wavepackets of quantum light intrinsically in the time domain.

    • Matthias Kizmann
    • , Thiago Lucena de M. Guedes
    •  & Guido Burkard

  • Letter |

    There has latterly been a renewed interest in collective excitations in condensed matter systems. Now, spectroscopic evidence for the so-called Leggett mode is revealed in the superconductor MgB2.

    • Flavio Giorgianni
    • , Tommaso Cea
    •  & Lara Benfatto

  • Article |

    A spectroscopic study of strontium titanate provides a method for transferring the vibrational energy of a low-frequency phonon mode to higher-frequency modes, with the potential to access elusive ‘silent’ modes.

    • M. Kozina
    • , M. Fechner
    •  & M. C. Hoffmann

  • Article |

    A polariton is a hybrid excitation resulting from strong light–matter coupling. The magneto-transport measurements have now revealed the crucial role played by its electronic component.

    • Gian L. Paravicini-Bagliani
    • , Felice Appugliese
    •  & Jérôme Faist

  • Letter |

    Picosecond pulses of terahertz radiation induce non-equilibrium electron dynamics in a GaAs quantum Hall system, suppressing the longitudinal resistivity, and giving rise to a quantized transverse component.

    • T. Arikawa
    • , K. Hyodo
    •  & K. Tanaka

  • Letter |

    Light can be used to directly excite phonon modes in condensed matter. Simultaneously exciting several modes in an antiferromagnetic rare-earth orthoferrite drives behaviour that mimics the application of a magnetic field.

    • T. F. Nova
    • , A. Cartella
    •  & A. Cavalleri

  • Letter |

    Josephson plasma waves — electromagnetic waves propagating between layered superconductors — lie at the basis of a broad variety of phenomena. Now, parametric amplification of such waves has been shown by tuning the phase between pump and seed waves.

    • S. Rajasekaran
    • , E. Casandruc
    •  & A. Cavalleri

  • News & Views |

    Intense light pulses irradiating a sample of K3C60 result in dramatic changes of its high-frequency (terahertz) conductivity. Could these be signatures of fleeting superconductivity at 100 K and beyond?

    • Jure Demsar

  • Letter |

    Kohn’s theorem states that the electron cyclotron resonance is unaffected by many-body interactions in a static magnetic field. Yet, intense terahertz pulses do introduce Coulomb effects between electrons—holding promise for quantum control of electrons.

    • T. Maag
    • , A. Bayer
    •  & M. Kira

  • Letter |

    Nanoscale metallic tips are a useful source of electrons for material characterization. It is now shown how terahertz radiation can provide precision control and enhancement of photoelectron emission from these sources. The approach can shape the spectrum of the electron pulse, which could pave the way to improvements in ultrafast electron diffraction and transmission electron microscopy.

    • L. Wimmer
    • , G. Herink
    •  & C. Ropers

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