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Spintronic Functionalities in Multiferroic Oxide-Based Heterostructures
Published in Tamalika Banerjee, Oxide Spintronics, 2019
Therefore, transport measurements are directly related to the magnetization. This has also allowed to infer changes in transition temperature in multiferroic structures. In ferroelectric/ferromagnetic semiconductor devices, where the coupling is mediated by an electric field (ferroelectric field effect devices), TC has been tuned by 5–10 K degree. Fully oxide structures, with a strongly correlated material (SCM) [80] acting as ferromagnetic showed the largest modulation on the magnetic properties induced by ferroelectric polarization reversal [47, 81]. The observed shift of the Curie temperature (TC) for the ferroelectrically gated SCM is much larger (by 40 K) than the one measured for an FM-SC channel (compare, for instance, Refs. [81] and [82]). The effects are also large (TC shifts for 16K) in polycrystalline SCM/ferroelectric structures grown on Si [55].
Molecular Physics Longuet-Higgins Early Career Researcher Prize 2017 winner profile
Published in Molecular Physics, 2018
When it comes to describing strongly correlated materials or molecules, the standard low cost methods, such as density functional theory (DFT), usually fail. While more involved wavefunction-based approaches could in principle be applied, they remain out of reach due to the computational cost. A natural and intuitive idea is to merge the two methods to build a new one that gathers all advantages: a low computational cost and good accuracy. From a mathematical point of view, such a combination is very similar to the so-called ‘embedding approaches’ which are becoming increasingly popular in quantum chemistry. Providing an exact formulation of the hybrid theory is far from trivial since the methods to be merged are written in completely different formalisms. My paper deals with the development and practical implementation of a novel and in-principle-exact embedding approach which is referred to as site-occupation embedding theory (SOET). We first tested it on the Hubbard model, which is mostly used in condensed matter physics for describing strongly correlated materials. We currently work on the extension of SOET to quantum chemistry, thus making the approach truly at the interface between physics and chemistry.