Emergent properties hidden in plain view: Strong electronic correlations at oxide interfaces
Center for Artificial Quantum Materials University of Arkansas, Physics Department, Fayetteville, AR 72701, USA
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 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 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 many-body
states not attainable in bulk. Understanding of these phases however
requires detailed microscopic studies of the heterostructure
properties. In this talk I will review our recent results on unit-cell
thin nickelates, titanates and cuprate-manganite heterostructures to
illustrate recently uncovered principles of rational materials design
and control of quantum many-body phenomena by the interface.
 J. Chakhalian et al, Nature Materials 11, 92-94 (2012).
 TeYu Chien et al, Nature Communications 4, 2336 (2013).
 Jian Liu et al, Nature Communications 4, 2714, (2013).
 J. Chakhalian et al, Review of Modern Physics, 86, 1189, (2014).