Fall 2019

September 13, 2019 (Friday) 4:00-5:00p.m. Small Hall 111
Speaker: Georg Schwiete, University of Alabama
Host: E. Rossi
Title: Transport phenomena in two-dimensional electron systems
Abstract: In this talk, I will discuss a number of physical mechanisms that have a strong influence on electronic transport in two-dimensional systems. At the lowest temperatures, localizating and delocalizing tendencies compete near a metal-insulator transition. At intermediate temperatures, the transport is dominated by scattering of electrons on a self-consistently created potential near impurities. When further increasing the temperature, electron-electron collisions gain importance and eventually lead to hydrodynamic behavior in the electronic system. I will explain how these mechanisms and phenomena reveal themselves in different ways in electric, thermal and thermoelectric transport.

September 20, 2019 (Friday) 4:00-5:00p.m. Small Hall 111
Speaker: Amlan Biswas, University of Florida
Host: M. Qazilbash
Title: Magnetoelectrism” in crystals: Controlling magnetic anisotropy with strain and electric fields
While the effect of an electric field on magnetism is firmly established, we are much more familiar with the equation M = cmH than with M=αE, where cm is the magnetic susceptibility and α quantifies the “magnetoelectric effect.” A reason for this unfamiliarity is that α is negligible for most magnetic materials. I will discuss our experimental results on controlling the direction (and not the magnitude) of M in the compound LaPrCaMnO3 with strain and electric fields. I will describe how the two main sources of magnetic anisotropy, viz. magnetocrystalline and shape anisotropy, can be modified using strain and electric fields due to the first order nature of the magnetic transition in LaPrCaMnO3. Ongoing experiments in our research group have been designed to fabricate and study these materials and further enhance their magnetoelectric properties.

October 4, 2019 (Friday) 4:00-5:00p.m. Small Hall 111
Speaker: Sami Mitra, Editor of Physical Review Letters
Host: E. Rossi
Title: PRL at 60: You have your physics results, now what?
In a talk that I am hoping will morph into a free-flowing Q and A session, I will discuss the role that PRL plays in disseminating your physics results. The process is a cascading sequence that entails interacting with journal editors, referees, conference chairs, journalists, department chairs, deans, funding agencies, and others. The tools, however, have changed in recent years; the arrival of social media, search engines, and electronic repositories have us in a state of flux. PRL published its first paper 60 (plus 1) years ago. Let's look back and forward.

About the Speaker: 
Samindranath (Sami) grew up in Kolkata and Delhi, and received his Ph.D. at Indiana University (Bloomington) in 1994 on theoretical aspects of the quantum Hall effect. After working on chemical physics at the Albert Einstein College of Medicine in New York City, he joined Physical Review Letters. Among his other responsibilities are papers on transport properties in semiconductors, 2D materials, and mesoscopic systems.

October 25, 2019 (Friday) 4:00-5:00p.m. Small Hall 111
Speaker: Patrick Meade, SUNY Stony Brook
Host: C. Carone
Future colliders and the Higgs
Abstract:  I will discuss the current status of LHC measurements and potential discovery prospects at future e+e- and pp colliders focusing on the Higgs.  I will emphasize how many of the unanswered questions about the Standard Model of particle physics are connected to measuring properties of the Higgs with higher precision. In particular I will point out how improving quantitative precision in certain measurements can lead to qualitative changes about our understanding of the universe.  I will primarily focus on a few examples from flavor physics and cosmology in making this case.

November 1, 2019 (Friday) 4:00-5:00p.m. Small Hall 111
Speaker: Jorge Piekarewicz, Florida State University
Host: J. Dudek
Nuclear Astrophysics in the New Era of Multimessenger Astronomy
Abstract: One of the overarching questions animating nuclear physics today is "How does subatomic matter organize itself". Neutron stars are cosmic laboratories uniquely poised to answer this fundamental question. The historical first detection of a binary neutron star merger by the LIGO-Virgo collaboration is providing fundamental new insights into the astrophysical site for the r- process and on the nature of neutron-rich matter. In turn, the study of nuclei at new exotic-beam facilities throughout the world will help elucidate the underlying dynamics of the r-process and the structure, dynamics, and composition of neutron stars. In this presentation I will discuss how this synergy — in combination with nuclear physics insights, modern theoretical approaches, and powerful statistical ideas — can pave the way to understanding these fascinating objects.