Past Events

  • Condensed Matter seminar: "Correlated Light-Matter Interactions and Excited-State Dynamics in Quantum Materials"

    David Rittenhouse Laboratory, A4

    Prineha Narang, Harvard University

    The physics of quantum materials is rich with spectacular excited-state and non-equilibrium effects, but many of these phenomena remain poorly understood and consequently technologically unexplored.

  • Condensed Matter seminar: "Control of light-matter interaction in 2D materials"

    David Rittenhouse Laboratory, A4

    Vinod Menon, The City College of New York

    Two-dimensional (2D) van der Waals materials have emerged as a very attractive class of optoelectronic material due to the unprecedented strength in its interaction with light. In this talk I will discuss approaches to enhance and control this interaction by integrating these 2D materials with microcavities, and metamaterials. I will first discuss the formation of strongly coupled half-light half-matter quasiparticles (microcavity polaritons) [1] and their spin-optic control [2] in the 2D transition metal dichacogenide (TMD) systems.

  • Special Condensed Matter seminar: "Topological materials science"

    David Rittenhouse Laboratory A8

    Claudia Felser (Director, Max Planck Institute Chemical Physics of Solids, Dresden)

    Topology, a mathematical concept, recently became a hot and truly transdisciplinary topic in condensed matter physics, solid state chemistry and materials science.

  • Condensed Matter seminar: "Let it rip: In vivo biomechanics studies of Hydra regeneration from tissue spheres"

    David Rittenhouse Laboratory, A4

    Eva-Maria Collins, Swarthmore College

    Hydra, named after the multi-headed monster in Greek mythology, is a radially symmetric freshwater polyp, a few mm in length. Hydra is famous for its regenerative capabilities, allowing it to regenerate from small tissue pieces and even from a "soup of cells" (cell aggregates). Because of its structural simplicity and strong regenerative potential, Hydra is a well-suited system for in vivo biophysical studies of regeneration and pattern formation. 

  • Condensed Matter seminar: "Patterning Superconductivity in a Topological Insulator"

    David Rittenhouse Laboratory, A4

    Nina Marković, Goucher College

    Topologically protected states in combination
with superconductivity hold promise for quantum
computing applications, but the progress on electrical
transport measurements in such systems has been impeded by the difficulty of obtaining devices with reliable electrical
contacts and fabricating circuits.

  • Special Condensed Matter seminar: "Anomalous charge and thermal transport in antiferromagnetic Weyl semimetals"

    David Rittenhouse Laboratory, 2N36

    Binghai Yan, Weizmann Institute of Science, Israel

    Topological Weyl semimetals provide a new stage to examine exotic transport phenomena such as the chiral anomaly and the anomalous Hall effect. In the ordinary longitudinal transport, the Wiedemann-Franz law links the ratio of electronic charge and heat conductivity to fundamental constants. It has been tested in numerous solids, but the extent of its relevance to the anomalous transverse transport, which represents the topological nature of the wave function, remains an open question. In this talk, I will first introduce recently-discovered Weyl materials Mn3Sn and Mn3Ge.

  • Condensed Matter seminar: "Delving Into the Nanoscale World With Thin-Film Nanofluidic Devices"

    David Rittenhouse Laboratory, A4

    Jason R. Dwyer, University of Rhode Island

    Thin film nanofluidic devices offer a diverse range of platform architectures and capabilities for nanoscale sample characterization and single-molecule sensing.

  • Condensed Matter seminar: "Fracton phase of matter: Lattice models, gauge theories and realizations"

    David Rittenhouse Laboratory, A4

    Yizhi You, Princeton University

    Fracton phase of matter shares many features of topological order, including long-range entangled ground states and non-trivial braiding statistics. At the same time, fracton phase contains subextensive ground-state degeneracy and the restricted mobility of quasiparticle which exclude itself from the TQFT paradigm. In this talk, I start from several solvable lattice models as candidates for Fracton order. Further, I will present a theoretical framework on higher rank Chern-Simons theory in 3D as the low energy effective theory for Fracton phase.

  • Condensed Matter seminar: "Quantum Many-Body Physics Beyond Ground States"

    David Rittenhouse Laboratory, A4

    Thomas Iadecola, University of Maryland

    Recently a set of traditional assumptions in quantum condensed matter theory has been upended by the realization that many-body systems can host stable quantum phenomena at infinite temperature.  I will discuss recent work suggesting that there is a much richer landscape of such phenomena than has so far been appreciated.  First, I will show how strongly disordered quantum many-body systems can spontaneously segregate into delocalized and localized degrees of freedom, leading to a so-called "mobility emulsion." Second, I will discuss how symmetries in otherwise generic sys

  • Condensed Matter seminar: "Excitons in Flatland: Exploring and Manipulating Many-body Effects on the Optical Excitations in Quasi-2D Materials"

    David Rittenhouse Laboratory, A4

    Diana Qiu, Lawrence Berkeley Laboratory

    Since the isolation of graphene in 2004, atomically-thin quasi-two-dimensional (quasi-2D) materials have proven to be an exciting platform for both applications in novel devices and exploring fundamental phenomena arising in low dimensions. This interesting low-dimensional behavior is a consequence of the combined effects of quantum confinement and stronger electron-electron correlations due to reduced screening.