Events

  • Department Colloquium

    David Rittenhouse Laboratory, A8

    Joshua Shaevitz, Lewis-Sigler Institute, Princeton University

    Host: Eleni Katiforiview more..

  • Physics and Astronomy Postponed Exams

    DRL, Room A8

  • Condensed Matter seminar: “The Berry curvature of metals and the crossover from composite fermions to exciton superfluid”

    David Rittenhouse Laboratory, A4

    Inti Sodemann-Villadiego, Max Planck Institute, Dresden

    The first part of this talk will summarise our progress in non-linear transport of metals. I will describe a non-linear Hall effect that is allowed by time reversal symmetry and is controlled by the "Berry curvature dipole” (the average of the Berry curvature gradient in momentum space). I will argue that such Berry curvature dipole offers a solution to the old problem of defining an “order parameter” for broken inversion symmetry in metals, by playing the role of a non-linear version of the Drude weight.

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  • High Energy Theory seminar: "Shift Symmetries in (A)dS"

    David Rittenhouse Laboratory, 2N36

    Kurt Hinterbichler, Case Western Reserve University

    I will discuss the generalizations of shift symmetries, galileon symmetries, and extended galileon symmetries to (A)dS space and to higher spin.   Unlike flat space, these symmetries are present only for particles with particular masses, and are related to partially massless symmetries.  For the case of scalars, I will discuss non-linear extensions of the symmetries and invariant interactions. This leads to a unique ghost-free theory in (A)dS space that is an (A)dS extension of the special Galileon.

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  • Dissertation Defense: "Aspects of Nucleation: Fluctuations, Nonuniform Order, and Curved Surfaces"

    DRL 2C2

    Eric Horsley

  • Condensed Matter seminar: "Tensor Gauge Theories of Fractons"

    David Rittenhouse Laboratory, A4

    Michael Pretko, University of Colorado

    A fracton is an unusual new type of emergent quasiparticle, first proposed in the context of quantum spin liquids, which does not have the ability to move by itself.  Rather, fractons can only move by forming certain bound states.  In this talk, I will show that symmetric tensor gauge theories provide a natural theoretical framework for fractons, with the unusual mobility restrictions encoded in a set of higher moment charge conservation laws, such as conservation of dipole moment.  I will then show how the tensor gauge theory formalism identifies the conventional ela

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  • Condensed Matter seminar

    David Rittenhouse Laboratory, A4

    Sagar Vijay, Harvard University

  • Experimental Particle Physics Seminar: "Applied cosmic ray physics and Brunelleschi's dome in Florence"

    David Rittenhouse Laboratory, A8

    Elena Guardincerri, LANL

  • Condensed Matter seminar

    David Rittenhouse Laboratory, A4

    Debanjan Chowdhury, Massachusetts Institute of Technology

  • 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.

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