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IRG I

Controlling Complex Electronic Materials

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Senior Participants: Darrell Schlom (MatSci, co-leader), Kyle Shen (Phys, co-leader), Joel Brock (ApplPhys), J. C. Séamus Davis (Phys), Craig Fennie (ApplPhys), Eun-Ah Kim (Phys), Andrew Millis (Phys, Columbia Univ.), David Muller (ApplPhys) • Collaborators: R. Hennig (MatSci, Cornell), S. A. Kivelson (Stanford Univ.), M. Lawler (SUNY Binghamton), A. P. Mackenzie (St. Andrews, UK), J. Mannhart (Augsburg, Germany), P. Schiffer (Penn State), J. Schubert (Research Centre Jülich, Germany), R. Uecker (Leibniz Institute for Crystal Growth, Germany)


The theme of our research is to understand and control complex electronic materials in which quantum many-body interactions can produce spectacular electronic and magnetic properties, such as colossal magnetoresistance, giant thermoelectric power, and high-temperature superconductivity. Starting from materials that are reasonably well described by current theory, we systematically perturb the electronic structure of the targeted materials through experimentally-accessible changes in electron overlap or carrier density, then use the observed changes in materials properties to drive advances in electronic structure theory. The combination of insights from theory and experiment will allow us to optimize the physical properties we are attempting to enhance, allowing us to “close the loop” between growth, experiment, and theory. Our long-term goal is to develop a general approach to optimizing properties in a wide range of materials, including high-temperature superconductors.