Computational Experiments Meet Real Experiments: Finding the Right Answer Through Cross-Validation

Recent advances in nanomaterial synthesis allow for the growth of near perfect-layered materials giving rise to a novel way to combine desirable properties from different materials and even possibly enhance their properties when grown together. Superlattices, which are a periodic layering of materials, are particularly useful in state of the art memory and energy storage devices. Our study focuses on ferroelectric lead titanate (PbTiO3 ) based superlattices. We use first principles density functional theory to explain the origin of a phenomenon that occurs ubiquitously in experiments, and that, to date, was not understood. This was, the existence of a preferred polarization state leading to an experimentally measured bias, which prevents the fabrication of ideal electronics. These results could only be obtained through an interactive journey that involved performing increasingly complex simulations and increasingly cleaner and reproducible experiments.

Bio

Simon Divilov is a PhD student in the Physics Department at Stony Brook University. Simon’s research focuses on using density functional theory to study surface, interface and defect properties of ferroelectric superlattices. Simon received his Bachelors of Science in Physics from City College of New York in 2011. His undergraduate research focused on cryogenic mesoscopic physics involving molecular nanomagnets and synthesizing topological insulators.

Speaker

Simon Divilov

Date

Wednesday, October 25, 2017

Time

12:00 pm

Location

IACS Seminar Room