Unconventional superconductors like cuprates, iron-pnictides and heavy fermion superconductors are examples of emergent states of matter that derive their amazing properties from the collective behaviour of interacting electrons. Despite the many differences between these materials, superconductivity seems to always occur near magnetically ordered phases leading to highly similar phase diagrams. Using ARPES, STM and optical spectroscopy we are searching for smoking-gun evidence of the interactions leading to superconducting instabilities.
iron pnictide hunds metal
Read more on pnictide SC.
Topological insulators are a new phase of quantum matter that emerges due to topological twists in the band structure of some materials. Our work focusses on the search for new topological materials using transport and spectroscopic techniques.
Complex oxide materials are the most widely studied playground for interacting electron systems displaying ordered states of matter. Among the many examples are cuprate superconductors, colossal magneto-resistance materials, Mott insulators like VO2 and V2O3 and oxide hetero-interfaces.
Current projects include the study of the metal-insulator transition in V2O3 (in collaboration with the Basov lab) and the study of the 2D electron gas that appears at the interface of two insulating oxides (typically LaAlO3 and SrTiO3). The latter project is work in collaboration with groups in the FOM national program entitled "2-dimensional electron devices in complex oxides".