Thomas Felix Rosenbaum (born February 20, 1955) is an American physicist and the current president of the California Institute of Technology.
Earlier he served as Provost and on the faculty of the University of Chicago, and was the Vice President for Research at Argonne National Laboratory.His research focuses on the behavior of matter at temperatures near absolute zero where quantum mechanical effects are manifest.
Rosenbaum recognized early the significance and ubiquity of quantum phase transitions—from metal–insulator transitions to magnetism to exotic superconductivity—and his work is recognized as putting quantum transitions on as solid a footing as that long available for classical transitions.
He has both exploited and advanced methods in experimental low temperature physics, developing new techniques (hydrostatic pressure, stress, magnetometry, calorimetry) for high-resolution studies at milliKelvin temperatures, complementing laboratory dilution refrigerator approaches with synchrotron x-ray measurements in diamond anvil cells at cryogenic temperatures.
He established the nature of the metal-insulator transition in doped semiconductors and correlated materials, and demonstrated macroscopic anisotropy of non-s-wave superconductivity in heavy fermion compounds.
Rosenbaum’s experiments on magnets involve controllable tuning of quantum fluctuations in both ordered and disordered systems.
He is interested in the macroscopic manifestations of quantum mechanics and harnessing disorder to craft a material’s electrical, magnetic, and optical response.