Dr. Chris Leighton University of Minnesota, USA
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Abstract: Recently, novel techniques have been developed where interfaces between solids and electrolytes (i.e., systems with dissolved, mobile ions), enable electrical induction of massive densities of charge carriers. These densities correspond to sizable fractions of an electron per unit cell in most materials, realizing electrical control over electronic phase transitions. In this talk I will give an overview of this technique, called “electrolyte gating”, before summarizing our results clarifying the mechanisms, capabilities, and applications of this approach, focusing on electrical control of magnetism [1-7]. The latter is important for technology, because it could enable new data storage and processing paradigms, critically, at low power consumption. Highlights will include understanding electrostatic vs. electrochemical gating mechanisms [1-3,6], modulation of magnetic ordering temperatures over record windows [1-6], and, using Fool’s Gold as a model system, voltage-induced ferromagnetism in even non-magnetic materials [7
Chris Leighton is a Distinguished McKnight University Professor of Chemical Engineering and Materials Science, a Distinguished University Teaching Professor, and a graduate faculty member in Physics at the University of Minnesota (UMN). Following a Bachelor’s Degree in Physics at the University of Durham in the UK (1994), and a Ph.D. in Condensed Matter Physics at the same institution (1998), he pursued post-doctoral research at UC San Diego with Prof. Ivan Schuller (1998-2001). He joined the Chemical Engineering and Materials Science faculty at UMN in 2001 as an Assistant Professor, rising to Associate Professor in 2007, and Professor in 2011. His research deals with electronic and magnetic properties of novel materials including complex oxides, oxide heterostructures, metallic spintronics, complex alloys, organic conductors, and earth-abundant photovoltaics. He has authored around 220 publications, which have accumulated almost 12,000 citations. He has received honors that include Fellowship in the American Physical Society, the Institute of Electrical and Electronics Engineers, and the Neutron Scattering Society of America, the Cozzarelli Prize from the Proceedings of the National Academy of Sciences, and UMN’s Morse-Alumni Association Teaching Award, Taylor Career Development Award, McKnight Presidential Fellowship, Taylor Distinguished Research Award, Distinguished McKnight University Professorship, Tate Award for Undergraduate Advising, and membership in the Academy of Distinguished Teachers. He currently serves as Lead Editor of Physical Review Materials.
Zoom Link:
https://arizona.zoom.us/j/85856505689
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