Ching-Yao Fong Photo
Ching-Yao Fong
The University of California
California
Biography
C. Y. Fong is a Distinguished Professor of Physics at the University of California, Davis. He is a Fellow of the American Physical Society and the Institute of Physics, UK. Professor Fong was elected as Chair of the American Physical Society, California-Nevada Section, in 2007, and he was selected as an Outstanding Referee by the American Physical Society in 2008. He has served as an Organization Committee Member for the International Conference and Exhibition on Mesoscopic & Condensed Matter Physics (2014), and as Chair of the Selection Committee for the Nicholas Metropolis Prize of the American Physical Society (2016). Professor Fong has edited two books – “Properties of Impurity States in Superlattice Semiconductors” and “Topics in Computational Materials Science” – and he currently serves as one of the editors of “Series on Spintronics,” World Scientific, Inc.. He is the author of two books titled, “Half Metallic Materials and Their Properties” and “Recent Progress in Silicon-based Spintronic Materials”. His recent publications include the explanation of measured magnetic moment in dilutely doped Mn in Si and the design of spintronic materials, e.g. the Si-based trilayers and Li-based half Heusler alloys based on the understanding of the electronegativity of elements, the Pauling principle, and the exchange interaction.
Role
OCM
International Conference on Magnetism and Magnetic Materials
Research Interests
Ching-Yao Fong research interests focus primarily on the design of new spintronic materials using first-principles algorithms based on density functional theory which is supported by National Science Foundation. In particular, materials exhibit half metallic properties. A half metal shows metallic properties in one of the electronic spin channels and semiconducting behaviors in the oppositely oriented spin channel. The feature is that the current of a half metal is 100% spin polarized. They can be utilized for information storage and transmission. To use the designed materials for device applications, it is necessary to do the following: (1) Checking the stability. This is done by calculating the properties of the phonon dispersions. (2) Determining the correct energy gap in the semiconducting channel by carrying out the so-called GW calculations and taking care of the different screening due to the presence of the metallic channel. Therefore, to design such materials, one should have (i) the basic understanding of quantum mechanics for electrons, phonons, magnons and many-body physics, and (ii) good physical intuitions about how electrons and their spin moments and ions interact including many-body effects. This is exemplified in my two co-authored books, “Half-metallic materials and their properties” published in 2013 and “Recent progress in silicon-based spintronic materials” published in 2015. They describe many experimental and theoretical methods using physical pictures for helping to build physical intuitions.
Ching-Yao Fong research interests focus primarily on the design of new spintronic materials using first-principles algorithms based on density functional theory which is supported by National Science Foundation. In particular, materials exhibit half metallic properties. A half metal shows metallic properties in one of the electronic spin channels and semiconducting behaviors in the oppositely oriented spin channel. The feature is that the current of a half metal is 100% spin polarized. They can be utilized for information storage and transmission. To use the designed materials for device applications, it is necessary to do the following: (1) Checking the stability. This is done by calculating the properties of the phonon dispersions. (2) Determining the correct energy gap in the semiconducting channel by carrying out the so-called GW calculations and taking care of the different screening due to the presence of the metallic channel. Therefore, to design such materials, one should have (i) the basic understanding of quantum mechanics for electrons, phonons, magnons and many-body physics, and (ii) good physical intuitions about how electrons and their spin moments and ions interact including many-body effects. This is exemplified in my two co-authored books, “Half-metallic materials and their properties” published in 2013 and “Recent progress in silicon-based spintronic materials” published in 2015. They describe many experimental and theoretical methods using physical pictures for helping to build physical intuitions.

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