Materials Science & Engineering Colloquium
Date: December 04, 2015 from 11:00 am to 12:00 pm EST
Location: Columbia University
Morningside Campus
Room 214 S.W. Mudd
Contact: For further information regarding this event, please contact Chris A. Marianetti by sending email to chris.marianetti@columbia.edu or by calling 212-854-9478.
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"Tuning electronic structure and the search for new quantum states"

Johnpierre Paglione
Center for Nanophysics and Advanced Materials
Department of Physics, University of Maryland

The quantum materials family has undergone a tremendous expansion in the last several years with the discovery of several insteresting physical phenomena. Adding to the already rich fields of unconventional superconductivity, heavy-fermion physics and quantum criticality, the new field of topological phenomena has attracted much interest, owing for instance to the "topological protection" inherent in these materials that may allow us to realize exotic quantum states of matter and advanced technologies. In this talk I will summarize our broad efforts to study both traditional and topological quantum matter via both materials synthesis and targeted experimentation, focusing on TI materials such as Bi2Se3 and the "new" mixed-valence topological Kondo insulator SmB6. I will also cover our continued work exploring the extremely versatile ThCr2Si2 (122) crystal structure, such as found in the iron superconductor KFe2As2, where we can experimentally control the occurrence of a severe structural collapse that allows for direct manipulation of the electronic structure and the exotic quantum states that derive from it.