A glimpse into the research of Nicolas Gauquelin on electron microscopy of emergent

Dr. Nicolas Gauquelin
Event Date and Time: 
Thu, 2018-02-01 11:00 - 12:30
Hennings 318
Local Contact: 
Leanne Ebbs
In this seminar I will walk you through my career as a scientist and use a few examples of my research to explain you how I have evolved from a chemist doing materials science to a physicist using advanced electron microscopes. One of the major fields of research in solid state physics over the last decade is the research of innovative non-silicon based electronics. The aim is to make smaller and more powerful electronic devices. This, however, requires fundamental research in the field of condensed matter physics, so new phenomena can be observed. The exact understanding of the origin of the observed phenomena is a key factor in creating the most optimal materials and in transforming research ideas into working devices. The most interesting new phenomena are observed when two materials interface or when the material’s dimensions are reduced. In systems with strong electron correlation, dimensionality effects appear which in turn can lead to new properties. As the materials investigated are complex, many factors such as strain, anion stoichiometry, cation intermixing, confinement effects, electronic reconstructions, band bending, orbital ordering, etc have to be considered when discussing the origin of the observed phenomena. To understand these properties, the materials need to be researched at an (sub-) atomic level, with attention to phenomena at interface level or in thin film. Electron Microscopy is the ideal method to understand structure property relationships at buried interfaces. Advances in electron microscopy instrumentation and techniques have allowed for higher quality and higher resolution images and have allowed for a better interpretation of the images. Through some examples on oxide thin-films, I will discuss advantages of microscopy to unravelling those physical properties.
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