Terahertz studies of semiconductors and nanostructures

In collaboration with J. Kono (Rice), we study the response of various semiconductors and nanostructured materials to coherent single-cycle terahertz (THz) excitations. THz radiation is in resonance with several energy and frequency scales characterizing semiconductors: the plasma frequency, the cyclotron frequency, the Fermi energy, the intra-impurity transition energy, phonon energy, etc. Therefore, the THz pulse excites a rich variety of coherent oscillations in the material and provides unique information about material parameters. THz spectroscopy is capable of probing such intriguing phenomena as the metal-insulator transition, polariton dispersion etc. In the recent paper submitted to Nature Physics (under review) we reported striking observations of interference of magnetoplasmon excitations in magnetized low-doped bulk InSb crystal and their theoretical modeling which provides outstanding agreement with observations.

Here you can find slides of a recent talk: PQE2009