PhD: Terahertz dynamics on strongly correlated materials

In the Laboratory for Functional Ferroic Materials we investigate materials where strong coupling between electrons leads to novel types of ordering processes of their spins and charges. Our scope is to study the fundamental physics of these materials with a focus on experimental basic research, yet including the perspective on the theoretical background and on technological relevance. Our experimental core technology is pulsed-laser spectroscopy between Terahertz and ultraviolet frequencies. In addition we apply atomic force microscopy, standard magnetic and dielectric characterization methods, Monte-Carlo simulation, and pulsed-laser-deposition of oxide thin films. The PhD project unites our internationally leading expertise in pulsed-laser spectroscopy, ultrafast dynamical processes, and ferroic materials. Its aim is to explore novel states of matter generated and/or detected in materials with strong electronic correlations by optical stimulation in the range of Terahertz frequencies. Possible phenomena may involve multiferroicity, superconductance, quantum-criticality, or non-Hermitian phase transitions. The project is targeted at the investigation of dynamical processes occurring on picosecond time scales in materials whose properties are characterized by strong electronic correlations. Its goal is to uncover novel states of matter or correlation phenomena and understand these at the microscopic level. The study of spin-related forms of coupling or even ordering are of central interest. Radiative excitation drives the system away from equilibrium, and the resulting excited state and its relaxation are investigated in in pump-probe experiments with Terahertz fields on the pump and/or probe sites. Candidates design and set up their workplace for Terahertz spectroscopy. Lasers are not just a tool, but part of the setup where candidates have no reservations to carry out basic adjustments or maintenance. They will also learn to work with cryogenic environments. They are never afraid to tear everything down and try a new approach, should this become necessary. Despite the focus on laser-optical experiments, the involvement of other experimental techniques and in-depth discussion with theoretical groups are likely requirements. For further details and application see: ferroic.mat.ethz.ch