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Showing 1–6 of 6 results
Advanced filters: Author: Flavio Giorgianni Clear advanced filters

  • Despite successes with nanostructures and 2D materials, optical modulation of second harmonic generation (SHG) has been elusive in bulk 3D materials. Here, the authors report ultrafast, all-optical, and highly efficient modulation of SHG in a barium borate crystal, achieved through resonant THz excitation that drives transient lattice deformations.

    • Flavio Giorgianni
    • Nicola Colonna
    • Adrian L. Cavalieri
    ResearchOpen Access
    Nature Communications
    P: 1-10

  • Thermal effects limit the speed of the electrically driven insulator-metal transition in V2O3 to tens of picoseconds. Here the authors show that under an intense THz-electric-field excitation the thermal regime can be overcome, achieving a purely electronic transition on ultrafast timescales.

    • Flavio Giorgianni
    • Joe Sakai
    • Stefano Lupi
    ResearchOpen Access
    Nature Communications
    Volume: 10, P: 1-6

  • The terahertz response of topological insulator surface states, in which relativistic electrons are protected from backscattering, possesses potential optic and plasmonic applications. Here, the authors demonstrate a nonlinear absorption response of Bi2Se3to terahertz electric fields.

    • Flavio Giorgianni
    • Enrica Chiadroni
    • Stefano Lupi
    ResearchOpen Access
    Nature Communications
    Volume: 7, P: 1-6

  • Recently, fabrication processes have realised three-dimensional nanoporous graphene. Here, the authors reveal two-dimensional Dirac plasmons in three-dimensional nanoporous graphene disclosing strong plasmonic absorptions tunable from terahertz to mid-infrared via controllable doping level and porosity.

    • Fausto D’Apuzzo
    • Alba R. Piacenti
    • Stefano Lupi
    ResearchOpen Access
    Nature Communications
    Volume: 8, P: 1-7

  • 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
    Research
    Nature Physics
    Volume: 15, P: 341-346

  • The use of intense light to control transient properties of quantum materials is a subject of current interest in ultrafast condensed matter physics. Here, a new up-conversion pathway for the optical control of Raman-active modes is demonstrated via a terahertz field-driven nonlinear process in the strongly-correlated metal, V2O3.

    • Flavio Giorgianni
    • Mattia Udina
    • Steven Lee Johnson
    ResearchOpen Access
    Communications Physics
    Volume: 5, P: 1-7