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  • Special Colloquium Nov 12, 2019

    The 25th Annual Cantrell Lecture Series: Representation theory and geometry

    Guest: Professor Geordie Williamson, University of Sydney
    Tuesday, November 12, 2019 3:30 pm - 4:30 pm
    Location: Physics Auditorium (202)

    The 25th Annual Cantrell Lecture Series

    This lecture series will focus on representation theory, from its origins in the study of finite groups by Frobenius in the final years of the 19th century, through to recent problems and questions. A theme throughout is the recurring presence of geometry in what at first appears an algebraic subject. The first lecture will be largely historical, and will provide a potted history of the subject up until the 1970s.

    The 2019 Cantrell Lecture Speaker will be Professor Geordie Williamson of the University of Sydney. 

    bonn_0.jpgProfessor Williamson is one of the world's foremost experts in geometric representation theory.   His counterexamples to the Lusztig conjecture have led to new and exciting research in the area of modular representation theory, in which he is one of the leaders.  Another of his major accomplishments involves joint work with Ben Elias which settled a long-standing conjecture about positivity of Kazhdan-Lusztig polynomials for arbitrary Coxeter groups.  Professor Williamson was awarded the Chevalley prize of the AMS (2016), a Clay Research Award (2016), the EMS prize (2016), the New Horizons in Mathematics prize (2017), and was elected a Fellow of the Royal Society (2018).

    Refreshments will be served at 3:00pm in the Physics Lobby.

  • Coffee Hour Nov 14, 2019

    Departmental Coffee Hour

    Guest: Prof. Dennis Bodewits, Department of Physics, Auburn University
    Thursday, November 14, 2019 2:30 pm - 3:30 pm
    Location: Physics Reading Room

    This is a reminder that we have our departmental coffee hour, today, at 2:30pm. We have our Colombian coffee and a fresh cheesecake!

    Please join us for a friendly discussion with Prof. Dennis Bodewits.

    Thanks to Dr. Abate to sponsoring this week’s coffee hour.

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  • Departmental Colloquium Nov 14, 2019

    Comets and the origins of water in our solar system

    Guest: Prof. Dennis Bodewits, Department of Physics, Auburn University
    Thursday, November 14, 2019 3:30 pm - 4:30 pm
    Location: Physics Auditorium (202)

    Comets are considered primitive left-overs from the era planet formation. Most comet science questions therefore revolve around whether observed properties are primordial, i.e. representative of conditions during the era of planet formation, or whether they are caused by subsequent processing. Comets may also have delivered water and complex molecules to Earth and other planets in our solar system. Finally, the discovery that our solar system is frequently visited by interstellar comets places comet science at the forefront of astrobiology. This talk will take attendees on a tour of what we know about comets, what mysteries we need to solve, and how future spacecraft and telescopes could help us answer our questions.

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    The Rosetta mission at comet 67P/Churyumov-Gerasimenko
  • CSP Lunch Seminar Nov 19, 2019

    A New Universality at a first order phase transition: The spin-flop transition in an anisotropic Heisenberg antiferromagnet

    Guest: Prof. David Landau, Center for Simulational Physics, University of Georgia
    Tuesday, November 19, 2019 12:30 pm - 1:30 pm
    Location: CSP Conference Room (322)

  • Coffee Hour Nov 21, 2019

    Departmental Coffee Hour

    Guest: Prof. Nathaniel P. Stern, Department of Physics and Astronomy, Northwestern University
    Thursday, November 21, 2019 2:30 pm - 3:30 pm
    Location: Physics Reading Room

    We have our departmental coffee hour, today at 2:30pm. Our guest is Prof. Nathaniel P. Stern.
    We also have a Persian treat today, it is called Ghorabie and is from northwestern part of Iran. I have attached some pictures of the Tabriz city, where it comes from.

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  • Departmental Colloquium Nov 21, 2019

    Playing with Photons in Flatland: Controlling Light and Matter in Two-Dimensional Materials

    Guest: Prof. Nathaniel P Stern, Department of Physics and Astronomy, Northwestern University
    Thursday, November 21, 2019 3:30 pm - 4:30 pm
    Location: Physics Auditorium (202)

    Light is a powerful tool of science. The quantum conception of light consisting of particles of discrete energy, or photons, underlies its interaction with matter. For solid materials, this understanding has led to transformational applications both as conventional as sensor and display technologies and as extraordinary as lasers. Despite this ubiquity, advances in materials science continue to reveal nuances in the interaction of light with matter. The emergence of layered two-dimensional materials of atomic-scale thickness presents a new two-dimensional landscape in which to play with the interaction between light and matter. These nanomaterials at the extreme limit of surface-to-volume ratio exhibit rich optical phenomenology such as layer dependent bandgaps and degenerate, but distinct, optically excited states. The unique features of atomically-thin materials suggest that these layered systems can be exploited to achieve new regimes of light-matter interactions. In this presentation, I will discuss photonic dressed states in monolayer semiconductors in which excitations of matter become entwined with the photon field. In particular, I will describe the emergence of spin- polarized half-light, half matter quasiparticles, or exciton-polaritons in transition metal dichalcogenides embedded in photonic microcavities. I will trace these novel photonic dressed states across strong and weak regimes, revealing quantum particles and quantum manipulation and adding to the toolbox for engineering novel applications harnessing the unique properties of low-dimensional nanomaterials.

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