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Current Seminars

November 2, 2017
Lattice QCD for Nuclear Physics
  • Dr. Andrew Walker-Loud, Lawrence Berkeley National Laboratory
  • Reception at 3:30pm in Dow 208
  • Seminar at 4pm in Dow 107
  • QCD, the fundamental theory of nuclear strong interactions, describes the interactions between quarks and gluons, not the nucleons and nuclei we observe in our experiments. While the theory is simple to write down, the complex dynamics of the interactions give rise to rich phenomena ranging from the color confinement of hadrons, the meson mediated nuclear force, fusion, fission and dense nuclear environments such as neutron stars. These same dynamics lead to a complexity of the interaction which prevents an analytic understanding of QCD at the low-energies relevant to these and other nuclear phenomena.

    A goal of nuclear physicists is to make a quantitative connection between QCD and our understanding of nuclear physics. At the bottom of this connection is lattice QCD, a numerical method that provides a rigorour, non-perturbative definition of QCD and allows for the computation of properties of nucleons and light nuclei directly from QCD. In the last few years, lattice QCD has emerged as a robust tool for computing the simplest properties of strongly interacting matter and now is being readily applied to quantities of interest for nuclear physics. I will introduce lattice QCD and describe some of these recent advances including a connection to Big Bang Nucleosynthesis and a very recent calculation of the nucleon axial charge, one of the most important benchmark calculations for validating lattice QCD calculations for nuclear physics.

November 16, 2017
Adventures in Multiferroics
  • Dr. William Ratcliff II, National Institute of Standards and Technologies
  • Reception at 3:30pm in Dow 208
  • Seminar at 4pm in Dow 107
  • Abstract: Multiferroics are materials which possess ferroelectric and magnetic order. For technological applications, we desire that these two order parameters be tightly coupled. Unfortunately, despite years of searching, there has been a paucity of these materials which are both ordered at room temperature, while evincing control of magnetism by an applied voltage. Thus, engineering artificial multiferroics using heterostructuring at the atomic scale is rapidly becoming an attractive alternative. In this work, we combined two crystallographically similar but poor multiferroic materials (LuFeO3 and LuFe2O4) to engineer a new family of ferromagnetic multiferroic heterostructures [1] which exhibit magnetoelectric coupling at room temperature. I will discuss the role of neutron scattering in understanding these materials. 

    [1] J. Mundy, et. al., “Atomically engineered ferroic layers yield a room temperature magnetoelectric multiferroic”, Nature 537, 523 (2016).

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