Shedding New Light on Dirac Materials with Nonlinear Optics
- Datum: 10.04.2019
- Uhrzeit: 11:00 - 12:00
- Vortragende(r): Rohit P. Prasankumar
- Los Alamos National Laoratory, Center for Integrated Nanotechnologies, USA
- Ort: CFEL (Bldg. 99)
- Raum: Seminar Room IV, O1.111
- Gastgeber: Andrea Cavalleri
We used terahertz (THz) magneto-optical spectroscopy to examine periodic arrays of graphene micro-ribbons, enabling us to control the transmission and Faraday rotation spectra of THz pulses via coupling to discretized magnetoplasmon modes. In the Weyl semimetal TaAs, time-resolved second harmonic generation enabled us to reveal a new photoinduced phase, and THz emission spectroscopy was used to provide new insight into the circular photogalvanic effect.
Finally, we used intense THz pulses to drive and coherently control structural dynamics in the topological insulator Bi2Se3. Overall, our studies demonstrate the utility of nonlinear optics in shedding new light on both static and dynamic properties of topological materials.