Past Events

  • Condensed Matter Seminar: "Atomic Crystals with New Twists"

    David Rittenhouse Laboratory, A4

    Jiwoong Park, Cornell University

    Chiral materials possess left- and right-handed counterparts linked by mirror symmetry, with applications in physics, chemistry and biology. In atomic crystals such as graphene, chiral symmetry emerges naturally as a consequence of the honeycomb lattice. In this talk, I will discuss two recent studies where the interaction between graphene and another surface breaks this chiral symmetry. The first example is chiral twisted bilayer graphene, a two-atom-thick chiral film, with giant circular dicrhoism.

  • Astro Seminar: "Large-Scale Structure Tests of Galaxy Formation and Modified Gravity"

    David Rittenhouse Laboratory, A4

    Ying Zu (Ohio State University).

    I will present novel tests of galaxy formation theories and the nature of gravity, using large-scale structure measurements from the Sloan Digital Sky Survey (SDSS). I will first introduce the iHOD model, a probabilistic framework for mapping galaxy properties to their underlying dark matter halos. By modelling the color dependence of galaxy clustering and weak gravitational lensing, iHOD reveals a surprisingly simple picture for "galaxy quenching", i.e., the cessation of star-formation activities within galaxies.

  • *Special* High Energy Seminar: "Monopole-antimonopole Creation and Other Numerical Studies"

    DRL 4N12

    Tanmay Vachaspati (Arizona State University)

    I will describe magnetic monopoles, their properties, and recent numerical work on their creation from particles.

  • High Energy Theory: "TBA"


    Tom Hartman (Cornell University)

  • Advances in Biomedical Optics Seminar: "Optical Diagnostics for Improved Pancreatic Disease Detection"

    Donner Auditorium, Basement, Donner Building, 3400 Spruce St.

    Mary-Ann Mycek (University of Michigan)

    Pizza will be served at 11:45am.

    These seminars are supported by the Biomedical Imaging and Spectroscopy Laboratory, the Center for Magnetic Resonance and Optical  Imaging, the Department of Radiology and the Department of Physics and Astronomy at the University of Pennsylvania.


    *Organizers: Wesley Baker, Jeff Cochran, Bryan Chong, Tiffany Ko, and Arjun Yodh,


    *Contact: Wesley Baker


    Lynch Lecture Hall Chemistry Complex

    Carl Weiman (Stanford)

    Guided by experimental tests of theory and practice, science has advanced rapidly in the past 500 years. Guided primarily by tradition and dogma, the learning and teaching of these subjects meanwhile has remained largely medieval. Research on how people learn is now revealing much more effective ways to learn, teach, and evaluate learning than what is in use in the traditional college class.

  • Astro Seminar: "Microwave Kinetic Inductance Detectors for High Contrast Imaging"

    David Rittenhouse Laboratory, A4

    Benjamin Mazin (UCSB)

    Microwave Kinetic Inductance Detectors, or MKIDs, are superconducting detector arrays that can measure the energy and arrival time of individual optical through near-IR photons without read noise or dark current.  I will report on the promising commissioning and first science results of the first two MKID Integral Field Spectrographs (IFSs) for high contrast imaging, the DARKNESS/SDC instrument at Palomar and the MEC/SCExAO instrument on Subaru.  Future upgrades to integrate the MKID IFS as a focal plane wavefront sensor for implement active speckle nulling will be discuss

  • Math-Bio seminar: "Spatial statistics in bioimage analysis"

    318 Carolyn Lynch Laboratory

    Thibault Lagache, Columbia University

    New advances in fluorescence microscopy make possible the localization of thousands of molecules with nanometer resolution inside living cells. This calls for the development of new statistical tools in spatial analysis to characterize molecules' distribution, and the spatial coupling between different molecules in multi-color microscopy. We will present the tools that we have recently developed.

  • High Energy Seminar: "TBA"

    David Rittenhouse Laboratory, 2N36

    Thomas Faulkner (University of Illinois, Urbana Champaign)

  • Astro Seminar: "Kinetic Inductance Detectors for CMB Studies"

    David Rittenhouse Laboratory, A4

    Bradley Johnson (Columbia University)

    I will discuss recent results from our kinetic inductance detector development projects.  Kinetic inductance detectors are superconducting thin-film, GHz resonators that are designed to also be optimal photon absorbers.  This detector technology is particularly well-suited for the sub-kelvin, kilo-pixel detector arrays needed for CMB studies because each detector element can be dimensioned to have a unique resonant frequency, and the probe tones for hundreds to thousands of detectors can be carried into and out of the cryostat on a single pair of coaxial cables.