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Professor Lane Martin University of California-BerkeleyHost: Jun Xiao (MS&E)
AbstractComplex-oxide materials possess a range of interesting properties and phenomena that make them candidates for next-generation devices and applications. But before these materials can be integrated into state-of-the-art devices, it is important to understand how to control and engineer their response in a deterministic manner. In this talk we will discuss the science and engineering of complex ferroic materials and the potential for emergent order and phenomena. We will explore the role of the epitaxial thin-film growth process and the use of epitaxial constraints to engineer a range of systems with special attention to ferroelectric and relaxor materials. In recent years, the use of epitaxial strain has enabled the production of model versions of these complicated materials and the subsequent deterministic study of field-dependent response. Here, we will investigate how new manifestations of epitaxial constraints can enhance electric field, stress, and temperature susceptibilities (i.e., dielectric, piezoelectric, pyroelectric, and electrocaloric effects). Among other topics, we will explore how superlattice routes can produce novel states of matter – such as polar vortices and skyrmions and the potential for topological protection and exotic function. The discussion will range from the development of a fundamental understanding of the physics that lies at the heart of the observed effects, to an illustration of routes to manipulate and control these effects, to the demonstration of solid-state devices based on these materials.
BiographyProfessor Lane W. Martin is Chancellor’s Professor and Chair of the Department of Materials Science and Engineering at the University of California, Berkeley and a Faculty Senior Scientist in the Materials Sciences Division at Lawrence Berkeley National Laboratory. Lane’s contributions to physical and materials science are broad reaching, but his focus is on advancing the synthesis, characterization, and utilization of emergent function (be that electronic, ferroic, multiferroic, etc.) in complex oxides. Lane applies innovative synthesis of highly controlled, epitaxial thin-film materials with special attention to accessing new states of matter, uses growth and epitaxy to access new insights about foundational materials physics, and pushes the edge of material response via strain, defect, and interfacial engineering. Lane embraces cross-disciplinary, collaborative research and leverages it to drive innovation.