Nonlinear Optics at Terahertz Frequencies – Detecting hidden phases in Cuprates

Srivats Rajasekaran
June 6th, 2018 SRIVATS RAJASEKARAN Max Planck Institute for the Structure and Dynamics of Matter, CFEL

Studying the strong-field light-matter interaction at terahertz frequencies (~1 THz) is most suitable for understanding excitations in solids occurring at few meV energy scales. One such excitation is the superconducting Josephson plasmon in high Tc Cuprates.

I will discuss the nonlinear electrodynamics of the plasmon which results in the generation of third harmonic radiation (THG). Further, I will show that THG can be used as a dynamical probe of superconducting correlations at temperatures far above Tc in specific underdoped Cuprates. These results are a compelling evidence for the presence of a ‘hidden’ periodic superfluid state in these materials.

Seminar, June 6, 2018, 15:00. ICFO’s Blue Lecture Room

Hosted by Prof. Simon Wall