Past Events

  • Condensed Matter seminar: "Designing quantum matter with superconducting nanowires"

    David Rittenhouse Laboratory, A4

    Nina Markovic, Goucher College

    Superconducting nanowires are an experimental realization of a model quantum system that features collective degrees of freedom and exhibits a host of non-equilibrium and non-local phenomena. The nature of the quantum states in nanowires is particularly sensitive to size and shape quantization, coupling with the environment and proximity effects.

  • Condensed Matter seminar: "Nano-photonic phenomena in van der Waals heterostructures"

    David Rittenhouse Laboratory, A4

    Dimitri Basov, Columbia University

    Layered van der Waals (vdW) crystals consist of individual atomic planes weakly coupled by vdW interaction, similar to graphene monolayers in bulk graphite. These materials can harbor superconductivity and ferromagnetism with high transition temperatures, emit light and exhibit topologically protected surface states. An ambitious practical goal is to exploit atomic planes of vdW crystals as building blocks of more complex artificially stacked heterostructures where each such block will deliver layer-specific attributes for the purpose of their combined functionality.

  • Astro Seminar: "Exodynamos: Magnetic Field Generation and Detectability"

    David Rittenhouse Laboratory, A4

    TBD

    Planetary magnetic fields are ubiquitous in the Solar System and extrasolar planets are common in the galaxy.  However, no extrasolar planetary magnetic field (or exodynamo) has yet been directly detected. Magnetic fields offer a unique window into the internal structure and dynamics of planets, can be remotely detected by electron cyclotron emission at radio wavelengths, and are commonly assumed to be important for surface habitability.

  • Condensed Matter seminar: "Braiding Light"

    David Rittenhouse Laboratory, A4

    Claudio Chamon, Boston University

    Many topological phenomena first proposed and observed in the context of electrons in solids have recently found counterparts in optical and acoustic systems. In this talk I will discuss non-Abelian Berry phases that can accumulate when coherent states of light are injected into “topological guided modes” in specially-fabricated photonic waveguide arrays. These modes are photonic analogues of topological zero modes  in electronic systems.

  • Astro Seminar: "Beyond Pluto: The Hunt for Planet X"

    David Rittenhouse Laboratory, A4

    Scott Sheppard (Carnegie Institution for Science)

    The Kuiper Belt, which has Pluto as the largest member, is a region of comet like objects just beyond Neptune.  This belt of objects has an outer edge, which we are now only able to explore in detail.  For the past few years we have been performing the largest and deepest survey ever obtained to search for distant solar system objects.

  • Dissertation Defense: "Hard-, Soft- and Sticky Spheres for Dynamical Studies of Disordered Colloidal Packings"

    LRSM, Reading Room

    Matthew Gratale (UPenn)

  • High Energy Theory: "Effective Field Theory of Dissipative Fluids"

    David Rittenhouse Laboratory, 2N36

    Hong Liu (MIT)

  • ABO Seminars: "Label-free Optical Micro Imaging of Tissue Histology in Vivo"

    Donner Building 3400 Spruce Street Donner Auditorium, Basement *Pizza served at 11:45am*

    Xingde Li (Johns Hopkins University)

    This seminar will focus on our recent progresses on developing high-resolution biophotonic imaging technologies, particularly the second-generation optical coherence tomography (OCT) endoscopy and multiphoton endomicroscopy. These technologies have shown significant translational potential for imaging tissue microanatomies in vivo at a resolution approaching or at standard histopathology but without the need for tissue removal, staining or processing.

  • Department Colloquium: "The Universe as a Lab for Fundamental Physics: Results from Spider and Future Suborbital Missions"

    David Rittenhouse Laboratory, A8

    William Jones (Princeton) Hosted by James Aguirre

    I will describe our recent results from observations of the Cosmic Microwave Background, including a status report on the recent flight of the Spider experiment, a balloon borne CMB polarimeter.  I will also discuss a convergence of observational needs and technological capabilities that provide intriguing opportunities for improving our understanding of both the late- and early-time evolution of the Universe.

     

    *Refreshments served @ 3:30pm, DRL 2nd Floor Faculty Lounge*

  • Condensed Matter seminar: "Wavefront Shaping for in vivo Brain Imaging"

    David Rittenhouse Laboratory, A4

    Na Ji, Janelia Research Campus

    There are about the same number of stars in our galaxy as there are neurons in our brain. To study stars and neurons using optical imaging, we face similar challenges of image degradation by aberrations and scattering. Adaptive optics, a form of wavefront shaping, has revolutionized astronomy by allowing ground-based telescopes to obtain high-resolution images of stars through Earth's turbulent atmosphere. Applying wavefront shaping to brain imaging is similarly beneficial.