Events Archive

Many-body ground states and collective excitations in a tunable 2D system
Tue, Nov 8, 2022, 12:30 pm1:30 pm

The Landau levels of a two-dimensional electron system support a plethora of fascinating many-body ground states and collective low-energy excitations, thanks to enhanced electron-electron interactions and the characteristics of the LL wave functions. The n=1 LL is particularly fascinating as it hosts even-denominator fractional quantum Hall…

Speaker
Special Condensed Matter Seminar - 3/14 - 3PM - Chen Fang "Many-body scar models from a symmetry perspective" - Jadwin JH room
Thu, Mar 14, 2024, 3:00 pm4:30 pm

Recently, a class of many-body Hamiltonians have been found to show exact periodic dynamics in the continuum of the energy spectrum where thermalization and chaos is expected. This phenomenon is known as the (exact) quantum many-body scar (QMBS) dynamics. We show that a wide range of QMBS models, plus many new ones, can be unified and…

Speaker
Faculty, post docs, grads
Condensed Matter Seminar - 3/12 - 12PM - Prof. Masatoski Sato (Kyoto University) "Bulk-boundary correspondence in point-gap topological phases" - Jadwin JH room
Tue, Mar 12, 2024, 12:00 pm1:30 pm

A striking feature of non-Hermitian systems is the presence of two types of topology. One generalizes Hermitian topological phases, and another is intrinsic to non-Hermitian systems, called line-gap topology and point-gap topology. Whereas the bulk-boundary correspondence is a fundamental principle in the former topology, its role in the latter…

Speaker
Faculty, post docs, grads
IAS HET Seminar | Mukund Rangamani, University of California, Davis, | “Superstring Partition Functions in AdS3” | Bloomberg Lecture Hall (IAS) & Zoom
Mon, Mar 11, 2024, 2:30 pm3:30 pm

I will describe the one-loop partition function for strings propagating on AdS3 geometries with NS-NS flux (for generic values of AdS radius in string units). The essential ingredients that go into this analysis have been known for a while. The goal will be to organize the result to facilitate comparison to…

Hamilton Colloquium Series, William East, Perimeter Institute , "New perspectives from extreme gravity" , Jadwin A10
Thu, Mar 7, 2024, 4:00 pm5:00 pm

 

Complementing the spectacular breakthroughs in gravitational wave and multi-messenger observations of merging black holes and neutron stars, advancements in our theoretical understanding and modelling of strong gravity are essential to elucidating the nonlinear dynamics of spacetime. These are motivated by the goal of unlocking…

A free lecture open to the public.
Mathematical Physics Seminar, Tues, Mar 5, 4:30pm, Jadwin A06, Alexander B. Watson, University of Minnesota, "Multiple-Scales Perspective on Moiré Materials""
Tue, Mar 5, 2024, 4:30 pm5:30 pm

In recent years, experiments have shown that twisted bilayer graphene and other so-called ``moiré materials'' realize a variety of important strongly-correlated electronic phases, such as superconductivity and fractional quantum anomalous Hall states. I will present a rigorous multiple-scales analysis justifying the (single-particle) Bistritzer…

Speaker
HET Seminar |Minjae Cho, Princeton| “A (non-)worldsheet description of strings in AdS and flux compactifications” | PCTS
Mon, Mar 4, 2024, 2:30 pm3:30 pm

 For backgrounds with known exact worldsheet theory descriptions, ordinary string perturbation theory can be employed to study observables such as spectrum and scattering. However, the majority of interesting string backgrounds, including AdS and flux compactifications, lack such descriptions, posing challenges in…

PGI Seminar Series Spring 2024 |Sam Gralla |University of Arizona | "Bob in a black hole, or: On Decoherence from Horizons"
Mon, Mar 4, 2024, 12:30 pm1:30 pm

Recently it was shown that black holes impart a fundamental rate of decoherence on all nearby quantum superpositions [Danielson, Satishchandran, Wald (DSW) 2022], eventually erasing all quantum information in their vicinity.  The effect can be understood from measurement and causality: An observer (Bob) in the black hole should be able to…

Twin Condensed Matter Special Seminar - 3/1 - 2:30 PM - Matan Uzan (Weizmann Institute) & Prof. Berthold Jaeck - Jadwin JH room
Fri, Mar 1, 2024, 2:30 pm4:00 pm

Matan Uzan - "de Haas-van Alphen spectroscopy and magnetic breakdown in moiré graphene"

(Followed by Prof. Berthold Jaeck)

Quantum oscillations(QO) originating from the quantization of the electron cyclotron orbits provide ultrasensitive diagnostics of electron bands and interactions in novel materials. We…

Speakers
Faculty, post docs, grads
IAS HET Seminar | Daniel Jafferis, Visiting Professor, Institute for Advanced Study; Harvard University| “Tensor Model for 3d Gravity” | Bloomberg Lecture Hall & Zoom
Fri, Mar 1, 2024, 11:00 am12:00 pm

I will describe a double scaled matrix and tensor integral whose Feynman diagrams can be organized in a 3d topological expansion which agrees term by term with partition functions of 3d gravity. The integral is taken over CFT2 data, and the limiting potential imposes bootstrap constraints. The conjecture that the…

Hamilton Colloquium Series, Mike Manfra, Purdue University, "Fractionalization of Charge and Statistics: Anyons in Condensed Matter Systems" , Jadwin A10
Thu, Feb 29, 2024, 4:00 pm5:00 pm

A basic tenet of quantum theory is that all elementary particles are either bosons or fermions. Ensembles of bosons or fermions behave differently due to differences in their underlying quantum statistics. Starting in the late 1970’s it was theoretically conjectured that excitations that are neither bosons nor fermions may exist under special…

A free lecture open to the public.
Mathematical Physics Seminar, Tues, Feb 27, 4:30pm, Jadwin A06, Ian Jauslin, Rutgers University, "A Criterion for Crystallization in Hard-Core Lattice Particle Systems"
Tue, Feb 27, 2024, 4:30 pm5:30 pm

As is well known, many materials freeze at low temperatures. Microscopically, this means that their molecules form a phase where there is long range order in their positions. Despite their ubiquity, proving that these freezing transitions occur in realistic microscopic models has been a significant challenge, and it remains an open problems in…

Speaker
Bootstrapping Black Holes - Henry Lin - Stanford University
Tue, Feb 27, 2024, 2:30 pm3:30 pm

Abstract: Two necessary ingredients of any quantum description of a black hole are strong coupling and a large number of degrees of freedom. Solving such quantum systems is therefore challenging, both analytically and numerically. We will discuss an alternative “matrix bootstrap” method that overcomes some of these challenges. After…

Faculty, post docs, grads
Special Seminar - 2/27 - 12PM - Zhurun (Judy) Ji (Stanford) "Probing topological and correlated states via nanoscale electrodynamics" - Jadwin Hall JH room
Tue, Feb 27, 2024, 12:00 pm1:30 pm

Nanoscale electrodynamics offers a unique perspective for unraveling the complex physics underlying these phenomena. This talk is focused on our studies on the intricate relationships among topology, geometry, and electron correlations in systems with flat bands. I will first discuss the exploration of a 3D quasi-crystalline system,…

Speaker
Faculty, post docs, grads
PGI Seminar Series Spring 2024 |Hans Ringstrom |KTH| "A quiescent regime for big bang formation"
Mon, Feb 26, 2024, 12:30 pm1:30 pm

Recently, many results concerning stable big bang formation have appeared. Most of the results concern stability of spatially homogeneous and isotropic solutions. However, a recent result of Fournodavlos, Rodnianski and Speck (FRS) covers the full regime in which stability is to be expected. On the other hand, it is restricted to…

Special Seminar - 2/26 - 12PM - Shaowen Chen "Visualizing Josephson Current with an Atomic Magnetometer" - Jadwin Hall PCTS
Mon, Feb 26, 2024, 12:00 pm1:30 pm

Characterization and quantum control of complex quantum matter is one of the shared goals for condensed matter and quantum information science research. Toward this end, my research uses van der Waals materials to synthesize topological and correlated states, and quantum sensors based on spin defects to uncover their microscopic picture…

Speaker
Faculty, Staff, Grads, Postdocs, Undergrads
Hamilton Colloquium Series, Mark Palmer, Brookhaven National Lab , "The Path to an Energy Frontier Muon Collider" , Jadwin A10
Thu, Feb 22, 2024, 4:00 pm5:00 pm

Muon colliders offer a unique path to multi-TeV, high-luminosity lepton collisions. Muon collisions with a center-of-mass energy of 10 TeV or above would offer significant discovery potential where the constituent collision energies exceed those of the LHC program by an order of magnitude. Significant progress on the fundamental R&D and…

A free lecture open to the public.
Mathematical Physics Seminar, Tues, Feb 20, 4:30pm, Jadwin A06, Gilles Parez, University of Montreal,"The Fate of Entanglement"
Tue, Feb 20, 2024, 4:30 pm5:30 pm

Entanglement is a fundamental property of quantum mechanics, and plays an increasing role in our understanding of many-body systems, in and out of equilibrium. In multipartite systems, different forms of entanglement can exist between various sets of particles, and its detection, even theoretical, remains an outstanding challenge. In this talk,…

Speaker
Dark Cosmos Seminar - 2/20 - 4PM - David Dunsky (NYU) "Primordial Black Holes from Axion Domain Wall Collapse" - Jadwin JH room
Tue, Feb 20, 2024, 4:00 pm5:30 pm

Besides providing a possible explanation to the strong CP problem and dark matter, the QCD axion possesses a rich cosmology. For example, if PQ breaking occurs after inflation, then axion cosmic strings form. Near the QCD phase transition, every axion string become attached to a domain wall which pull on the strings and cause the string-wall…

Speaker
Faculty, post docs, grads
HET Seminar |Masahito Yamazaki, IPMU| “Exploring Theta-Vacua of 4d Pure Yang-Mills Theories” | PCTS
Mon, Feb 19, 2024, 2:30 pm3:30 pm

We study 4d SU(N) pure Yang-Mills theory with a topological theta-angle. It has been a long standing problem to study the theta-dependence of the free energy, and to settle on the fate of the CP symmetry at theta=pi. In this talk we introduce a new lattice gauge theory technique called the "subvolume method", which…