Speaker: Jak Chakhalian
Affiliation: University of Arkansas, USA
Abstract Details: Complex oxides are a class of materials characterized by a variety of competing interactions that create a subtle balance to define the lowest energy state and lead to a wide diversity of intriguing properties ranging from high Tc superconductivity to exotic magnetism and orbital phenomena. By utilizing the bulk properties of these materials as a starting point, interfaces between different classes of complex oxides offer a unique opportunity to break the fundamental symmetries present in the bulk and alter the local environment. Utilizing our recent advances in oxide growth, we can now combine materials with distinct or even antagonistic order parameters to create new materials in the form of heterostructures with atomic layer precision. The broken lattice symmetry, strain, and altered chemical and electronic environments at the interfaces then provide a unique laboratory to manipulate this subtle balance and enable novel quantum states not attainable in bulk. Understanding of these phases however requires detailed microscopic studies of the heterostructure properties. In this talk I will summarize our recent work on unit-cell thin nickelate heterostructures to illustrate recently uncovered principles of rational materials design and control of interactions by the interface. Selected references for the talk: J. Chakhalian et al, Science, v. 314, 1114, (2007). Jian Liu et al, Phys. Rev. B 83, 161102(R) (2011). J. Freeland et al, Europhys. Letters, 96 (2011) 57004. J. Chakhalian et al, Phys. Rev. Letters, 107 116805 (2011). J. Chakhalian et al, Nature Materials 11, 92–94 (2012).

About The Speaker: 2002 – Ph.D. in condensed matter physics, The University of British Columbia, Canada. 2003 – Postdoctoral Researcher at TRIUMF Canada’s National Research Facility. 2003-2006 – Fellow at Max Planck Institute for Solid State Research, Stuttgart, Germany 2006 – Assistant Professor, University of Arkansas, Fayetteville, USA 2007 – Presidential Young Investigator Career Award, National Science Foundation. 2010 – Associate Professor, University of Arkansas, Fayetteville, USA 2010 – John Imhoff Outstanding Research Award, Sigma Xi Society. 2011 – French Government Award for synchrotron research. 2012 – Director of Laboratory for Artificial Quantum Materials. 2012 – Charles and Claudine Scharlau Professor of Physics, University of Arkansas, Fayetteville, USA.

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