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Showing 1–5 of 5 results
Advanced filters: Author: Luca Tomarchio Clear advanced filters

  • High quality thin films of the intrinsic magnetic topological insulator MnBi2Te4 were studied by means of optical spectroscopy in a broad spectral range from THz to UV. By analysing the optical conductivity at room temperature for different thickness, the presence of surface topological states superimposed to the bulk electrodynamics response was highlighted. For the thinnest film, where charge transport is dominated by the Dirac surface states, the interplay between the magnetic phase transition and the topological surface states was investigated. Crossing the Neèl temperature, the optical conductivity measurements indicate the opening of a magnetic gap at the Dirac node

    • Luca Tomarchio
    • Lorenzo Mosesso
    • Stefano Lupi
    ResearchOpen Access
    NPG Asia Materials
    Volume: 14, P: 1-7

  • Delafossite PdCoO2 boasts outstanding electronic transport properties, making it an interesting plasmonic material. Here, experimental evidence of surface plasmons in micro-ribbon samples is presented.

    • Salvatore Macis
    • Luca Tomarchio
    • Stefano Lupi
    ResearchOpen Access
    Communications Physics
    Volume: 5, P: 1-6

  • We investigate how random scattering modulates the optical properties, from terahertz to ultraviolet, of a three-dimensional graphene network based on interconnected high-quality 2-Dimensional graphene layers. We show how the connectivity and morphology of these materials allow a broadband interaction with light. The 3D graphene networks behave like a high-pass optical filter due to spatially multiscale random scatterers, corresponding to pores and graphene branches in the 3D network. We develop a model based on the Radiative Transfer theory describing the interaction of the network with light, from which we estimate the photon scattering mean free path.

    • Luca Tomarchio
    • Salvatore Macis
    • Stefano Lupi
    ResearchOpen Access
    NPG Asia Materials
    Volume: 13, P: 1-8