91福利

Terahertz time-domain spectroscopy (THz-TDS) provides a powerful probe of quasiparticles in condensed matter. Terahertz radiation interacts with numerous excitations, such as surface plasmons, excitons and magnons, with unique spectral signatures. In addition THz-TDS enables the non-contact determination of the conductivity and photoconductivity of materials. In this seminar I will highlight some of our recent work using terahertz spectroscopy. I will discuss the influence of surface states on the conductivity of III-V semiconductor nanomaterials, such as nanopores and nanowires. Magnetoelectric multiferroics, with coupled magnetic and ferroelectric orders, can exhibit spin-waves (magnons) at gigahertz and terahertz frequencies. I will also present our recent work on magnons and electromagnons -- coupled spin-phonon excitations -- in bulk and thin-film multiferroics.