The Fall 2022 MatSE 590 for graduate students consists of an exciting and jam-packed schedule. MATSE 590 is a colloquium (1-3 credits) consist of a series of individual lectures by faculty, students, or outside speakers.
Graduate students will receive a weekly email with information via @psu.edu email. Graduate students are required to attend all 590 Seminars. If you have any questions, please email GradOffice@matse.psu.edu.
October 13, 2022 - "Uncovering Emergent Correlations in Materials using Comprehensive X-ray Scattering Studies"
Jacob Ruff, Director, the Center for High Energy X-ray Science (CHEXS)
Abstract
Crystal structure determination provides ground truth for materials
physics. The process is relied upon so thoroughly that structures derived
from diffraction measurements are commonly referred to as solutions, a term
rarely used to describe experiments otherwise. However, many materials only
approximate the perfect crystal ideal, and manifest emergent symmetries on
local length scales that are not rigorously described by any of the 230 space
groups. There are, in other words, many types of structures that we do not
yet know how to solve. The physical importance of local and incommensurate
superstructures in materials should not be understated. The study of these
superstructures across wide ranges of temperature and other thermodynamic
perturbations requires new experimental infrastructure and methods, rooted in
data science. In this seminar I will survey some new approaches that are
being developed to measure, identify, and understand emergent quantum phases
in materials, using comprehensive x-ray studies at CHEXS.
Biographical Information
Jacob Ruff employs synchrotron x-ray sources to
understand the emergent quantum properties of materials. He studied physics
at the University of Waterloo (BSc 2004) and McMaster University (PhD 2010).
Subsequently he held the Director's Fellowship at Argonne National Lab,
before joining the scientific staff of the Cornell High Energy Synchrotron
Source (CHESS) in 2012. He has helped to design, build, and operate several
modern instruments at CHESS, most recently the QM2 and HMF beamlines. In
2020, Jacob was appointed the Director of the newly-formed Center for High
Energy X-ray Science at Cornell, which has a mandate to advance scientific
knowledge in engineering, biology, and materials research using x-rays.
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