Fennie, Craig

Other Contributing Faculty

Applied and Engineering Physics

Research Interests

Our interests lie at the intersection of Condensed matter/materials physics and solid state chemistry and can be broadly characterized as centered on the use of theory to elucidate the fundamental principles that govern the relationship between the structure and the macroscopic behavior of complex bulk, thin film, and heterostructured materials in which lattice, magnetic, orbital, and/or electronic degrees of freedom are active

 In this regard we are particularly interested in understanding how the composition, symmetry, geometry, and topology of crystalline motifs influence the interplay among the active degrees-of-freedom, how this subsequently manifests itself in the macroscopic properties, and if this interplay can be controlled so as to produce "designer" properties and functionalities.

We are fascinated by systems in which understanding the structural complexity is key to explaining their macroscopic properties and in particular by systems under extreme environments where chemical intuition often breaks down. Our modus operandi combines microscopic Hamiltonians/models with fundamental principles of solid-state chemistry and first-principles simulations.

Today, first-principles quantum techniques are powerful tools for analyzing and interpreting the properties of crystalline materials, yet the theoretical design of new materials with targeted properties remains challenging. Why? At a somewhat fundamental level, that the laws governing the physics of materials are in fact relatively simple, it is just that the behavior of the constituents as a whole are complex. Indeed, materials are made up of atoms whose type, number, and arrangement - the crystalline motif - creates distinct properties that emerge through the collective behavior of the seemingly simpler, well-understood parts. The discovery of emergent phenomena in condensed matter systems is therefore intimately linked with that of discovering the crystalline materials that display these phenomena.

This work by its very nature has to cross the border between the traditional disciples of physics and of chemistry, and when successful impacts both fields. As a long-term goal of ours is to develop an ab initio strategy towards materials discovery (sometimes referred to as "materials-by-design"), it is my strong belief that it would be quite difficult to make a meaningful and long-lasting impact without engaging both disciplines with the same drive and focus. 

Email: fennie@cornell.edu
Phone: 607-255-6498
Website: http://www.aep.cornell.edu/people/profile.cfm?netid=cjf76