Nonlinear response in THz frequency has attracted considerable attention since highly-intriguing phenomena can emerge in many-body systems far out of equilibrium. We have studied the Higgs amplitude mode in superconductors and found that THz third harmonic generation appears very strongly due to the resonance with the Higgs mode assisted with impurity scattering. Recently we also found the efficient THz third harmonic generation in a Dirac semimetal at room temperature originating from coherent intraband acceleration of massless electrons. The result would open a new route for efficient frequency conversion and mixing in high-speed electronics.

Chair: Eun-Gook Moon

This event is jointly organized by the Korea Institute for Advanced Study and the University of Tokyo. “Correlated Electrons Virtual International Seminars (CEVIS)” https://sites.google.com/view/cevis2020/home