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Showing 1–4 of 4 results
Advanced filters: Author: Harry T. Jonkman Clear advanced filters

  • Quantization of the current flowing across a nanometre-scale constriction in graphene is usually destroyed through charge-scattering from rough edges and impurities. But by using high-quality suspended samples and a constriction whose length is shorter than its width, conductance quantization in graphene has now been demonstrated.

    • Nikolaos Tombros
    • Alina Veligura
    • Bart J. van Wees
    Research
    Nature Physics
    Volume: 7, P: 697-700

  • A study of the transport of electron spin in single layers of graphene examines how graphene could be a promising material for spintronics applications. Experiments carried out by contacting graphene sheets with four ferromagnetic cobalt electrodes through a thin insulating layer find that electron spin is transported over lengths of 1–2 micrometres. It is expected that longer distances should be possible by improving the electronic quality of the samples.

    • Nikolaos Tombros
    • Csaba Jozsa
    • Bart J. van Wees
    Research
    Nature
    Volume: 448, P: 571-574

  • Two-photon excitation is attractive for photodynamic therapy as it potentially allows deeper penetration within biological tissue and targeting with better precision. However, two-photon cross-sections of light-sensitive drugs are typically small, which has until now limited their practical utility. Now Anderson and colleagues have come up with a new family of light-sensitive drugs that are designed for efficient two-photon excitation. They demonstrate selective closure of blood vessels in mice using one of their new drugs.

    • Hazel A. Collins
    • Mamta Khurana
    • Harry L. Anderson
    Research
    Nature Photonics
    Volume: 2, P: 420-424