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X-WR-CALDESC:Events for Department of Physics and Astronomy
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210907T100000
DTEND;TZID=America/New_York:20210907T140000
DTSTAMP:20220814T075451
CREATED:20210811T192915Z
LAST-MODIFIED:20210922T182818Z
UID:15616-1631008800-1631023200@physics.unc.edu
SUMMARY:Quantum Many-Body Days - X.-G. Wen & X. Qi
DESCRIPTION:The conference on Recent Progress in Many-Body Theories (RPMBT) will take place here at UNC in September 2022.\nAs a bridge program\, this year we are hosting a series of virtual talks in September 2021: the Quantum Many-Body Days.\nThe format of these talks will be 45 minutes for presentation and 15 minutes for questions and discussion. Please see below links for more information. \n\n\n\nMore information here: https://tarheels.live/rpmbt21/schedule/\nZoom link: https://unc.zoom.us/j/94760934546\, p/w: 314159\nYouTube live link: https://www.youtube.com/channel/UCOUN5aVy-vUWgwm4CxloGTw \n\n\n\nLocal organizing committee\nJ. Drut (Chair)\, G. Basar\, A. Nicholson\, S. Chandrasekharan\, L. Mitas\, and T. Papenbrock \n\n\nSeptember 7th\, 2021: Topology and gauge theories\n“Emergent higher symmetry and topological order”\nX.-G. Wen – 10am\nSession chair: Drut\nIntroductory remarks: Ortiz\n“Quantum information measure of space-time correlation”\nX. Qi – 1pm\nSession chair: Batista
URL:https://physics.unc.edu/event/quantum-many-body-days-x-g-wen-x-qi/
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210914T100000
DTEND;TZID=America/New_York:20210914T120000
DTSTAMP:20220814T075451
CREATED:20210811T193028Z
LAST-MODIFIED:20210922T182827Z
UID:15623-1631613600-1631620800@physics.unc.edu
SUMMARY:Quantum Many-Body Days - R. Melko & F. Verstraete
DESCRIPTION:The conference on Recent Progress in Many-Body Theories (RPMBT) will take place here at UNC in September 2022.\nAs a bridge program\, this year we are hosting a series of virtual talks in September 2021: the Quantum Many-Body Days.\nThe format of these talks will be 45 minutes for presentation and 15 minutes for questions and discussion. Please see below links for more information. \n\n\n\nMore information here: https://tarheels.live/rpmbt21/schedule/\nZoom link: https://unc.zoom.us/j/94760934546\, p/w: 314159\nYouTube live link: https://www.youtube.com/channel/UCOUN5aVy-vUWgwm4CxloGTw \n\n\n\nLocal organizing committee\nJ. Drut (Chair)\, G. Basar\, A. Nicholson\, S. Chandrasekharan\, L. Mitas\, and T. Papenbrock \n\n\n\nSeptember 14th\, 2021: Machine learning and computational physics\n“Reconstructing quantum states with generative models”\nR. Melko – 10am\nSession chair: Nicholson \nGenerative models are a powerful tool in unsupervised machine learning\, where the goal is to learn the unknown probability distribution that underlies a data set. Recently\, it has been demonstrated that modern generative models adopted from industry are powerful enough to reconstruct quantum states\, given projective measurement data on individual qubits. These virtual reconstructions can then be studied with probes that may be unavailable to the original experiment. In this talk I will outline the strategy for quantum state reconstruction using generative models\, and show examples on experimental data from a Rydberg atom quantum simulator. I will discuss the continuing theoretical development of the field\, including the exploration of powerful autoregressive models for the reconstruction of mixed and time-evolved quantum states. \n“Simulating strongly correlated systems with tensor networks”\nF. Verstraete – 11am\nSession chair: Ortiz \nTensor networks model the entanglement degrees of freedom of quantum many-body wavefunctions\, and give rise to a powerful variational ansatz for simulating low-energy states of the corresponding quantum Hamiltonians. This talk will highlight recent advances in the field of tensor networks\, including entanglement scaling methods\, state of the art PEPS algorithms\, and the description of symmetries in topological phases of matter.
URL:https://physics.unc.edu/event/quantum-many-body-days-r-melko-f-verstraete/
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210914T110000
DTEND;TZID=America/New_York:20210914T130000
DTSTAMP:20220814T075451
CREATED:20210902T142606Z
LAST-MODIFIED:20210913T163008Z
UID:15703-1631617200-1631624400@physics.unc.edu
SUMMARY:Physics and Astronomy Prelim - Jake Brooks
DESCRIPTION:UNC-CH Physics and Astronomy Prelim\n \nJake Brooks\n \n“Actuating Surface Attached Post (ASAP) Arrays as Pumps and Swimmers in Low Reynolds Number Environments” \nCilia are slender organelles protruding from the surface of many biological cells. These structures are present throughout the body and serve to drive fluid flow over the tissue surface. These cilia have inspired research in micro-actuators to study fluid transport and mixing phenomena in a low Reynolds number environment. We have developed a process for mold-and-release fabrication of actuating surface-attached post (ASAP) arrays with cross-sectional areas of less than 1 square micron at aspect ratios as high as 23:1. We also have control over the cross-section shape of individual posts and lattice parameters of their lateral organization. Our protocol includes centrifugal deposition of magnetic material into the molds\, which yields micropillars with paramagnetic tips. The ASAP can then be actuated with a dynamic magnetic that allows us to have predictable control over the actuation pattern of a given ASAP geometry. This high level of design control gives us freedom to tailor ASAP arrays to study fluid pumping\, fluid mixing\, and particle capture applications. We are also working on ASAP-driven synthetic micro-swimmers. Fluid pumping experiments will guide ASAP micro-swimmer design\, as the swimming problem can be thought of as a different reference frame of the pumping problem. We are expanding the applications of the ASAP platform to include dynamic topography-independent cell motility substrates by immersing ASAP with lower modulus compliant gel. These substrates have well-defined changes in stiffness directly from the ASAP geometry. By actuating ASAP within this soft material\, we create localized stresses to individual cells to induce a cell response. \nA public version of this event will be held via Zoom: https://unc.zoom.us/j/93985408948?from=addon
URL:https://physics.unc.edu/event/physics-and-astronomy-prelim-jake-brooks/
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210914T160000
DTEND;TZID=America/New_York:20210914T170000
DTSTAMP:20220814T075451
CREATED:20210913T030344Z
LAST-MODIFIED:20210913T030344Z
UID:15769-1631635200-1631638800@physics.unc.edu
SUMMARY:PFS Lecture 2: Introductory Calculus
DESCRIPTION:Need a refresh on derivatives and integrals with a single variable? Come out to PFS this week for a seminar taught by your peers within the Physics Department!
URL:https://physics.unc.edu/event/pfs-lecture-2-introductory-calculus/
LOCATION:Phillips 277
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210921T110000
DTEND;TZID=America/New_York:20210921T120000
DTSTAMP:20220814T075451
CREATED:20210811T193152Z
LAST-MODIFIED:20210922T182839Z
UID:15626-1632222000-1632225600@physics.unc.edu
SUMMARY:Quantum Many-Body Days - H. Nishimori & M. J. Savage
DESCRIPTION:The conference on Recent Progress in Many-Body Theories (RPMBT) will take place here at UNC in September 2022.\nAs a bridge program\, this year we are hosting a series of virtual talks in September 2021: the Quantum Many-Body Days.\nThe format of these talks will be 45 minutes for presentation and 15 minutes for questions and discussion. Please see below links for more information. \n\n\n\nMore information here: https://tarheels.live/rpmbt21/schedule/\nZoom link: https://unc.zoom.us/j/94760934546\, p/w: 314159\nYouTube live link: https://www.youtube.com/channel/UCOUN5aVy-vUWgwm4CxloGTw \n\n\n\nLocal organizing committee\nJ. Drut (Chair)\, G. Basar\, A. Nicholson\, S. Chandrasekharan\, L. Mitas\, and T. Papenbrock \n\n\n\nSeptember 21st\, 2021: Quantum computation / quantum information\n“Quantum simulation by quantum annealing”\nH. Nishimori – 10am\nSession chair: Papenbrock \nAfter a brief introduction to quantum annealing and an overview of the status of quantum simulation by quantum annealing\, I describe our recent quantum simulations using the D-Wave quantum annealers on the Kibble-Zurek mechanism for defect formation in a quantum chain and the Griffiths-McCoy singularity for low-dimensional diluted random magnets. \n“Quantum Computing for Nuclear Physics”\nM. J. Savage – 11am\nSession chair: Batista \nTheoretical predictions of the properties and dynamics of quantum field theories and quantum many-body systems of importance to nuclear physics research\, from dense and/or non-equilibrium matter\, to systems of neutrinos\, to jet production in heavy-ion collisions\, require\, in many instances\, computational capabilities beyond the realm of classical computing. As highlighted by Feynman and others in the early 1980s\, such systems may be amenable to future quantum simulations. I will discuss recent advances towards achieving these objectives and the connections to quantum information and other domain sciences.
URL:https://physics.unc.edu/event/quantum-many-body-days-m-j-savage-h-nishimori/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210928T100000
DTEND;TZID=America/New_York:20210928T120000
DTSTAMP:20220814T075451
CREATED:20210811T193403Z
LAST-MODIFIED:20210924T184920Z
UID:15628-1632823200-1632830400@physics.unc.edu
SUMMARY:Quantum Many-Body Days - S. Sachdev & M. Metlitski
DESCRIPTION:The conference on Recent Progress in Many-Body Theories (RPMBT) will take place here at UNC in September 2022.\nAs a bridge program\, this year we are hosting a series of virtual talks in September 2021: the Quantum Many-Body Days.\nThe format of these talks will be 45 minutes for presentation and 15 minutes for questions and discussion. Please see below links for more information. \n\n\n\nMore information here: https://tarheels.live/rpmbt21/schedule/\nZoom link: https://unc.zoom.us/j/94760934546\, p/w: 314159\nYouTube live link: https://www.youtube.com/channel/UCOUN5aVy-vUWgwm4CxloGTw \n\n\n\nLocal organizing committee\nJ. Drut (Chair)\, G. Basar\, A. Nicholson\, S. Chandrasekharan\, L. Mitas\, and T. Papenbrock \n\n\n\nSeptember 28th\, 2021: Universal behavior and strongly coupled theories\n“Fermi surfaces large and small: unifying theories of the Kondo lattice and Hubbard models”\nS. Sachdev – 10am \n\n\nFermi surfaces which obey the Luttinger theorem are often referred to as “large”. However\, it is possible to have “small” Fermi surfaces with electron-like quasiparticles\, in certain metallic states (sometimes called FL*) which evade the Luttinger theorem using emergent gauge fields. It is relatively easy to construct FL* states in Kondo lattice models\, but much harder in a single band Hubbard model. I will describe a new approach which yields a variational wavefunction for FL* in the Hubbard model\, and also a theory for the transition between small and large Fermi surfaces. The key idea is to avoid fractionalizing the electron\, and to instead fractionalize a paramagnon into a pair of ancilla qubits. I will note applications to the phase diagram of the cuprates. \n“Boundary criticality of the O(N) model in d = 3 critically revisited”\nM. Metlitski – 11am\nSession chair: Basar \nIt is known that the classical O(N) model in dimension d > 3 at its bulk critical point admits three boundary universality classes: the ordinary\, the extra-ordinary and the special. The extraordinary fixed point corresponds to the bulk transition occurring in the presence of an ordered boundary\, while the special fixed point corresponds to a boundary phase transition between the ordinary and the extra-ordinary classes. While the ordinary fixed point survives in d = 3\, it is less clear what happens to the extra-ordinary and special fixed points when d = 3 and N is greater or equal to 2. I’ll show that formally treating N as a continuous parameter\, there exists a critical value Nc > 2 separating two distinct regimes. For N < Nc the extra-ordinary fixed point survives in d = 3\, albeit in a modified form: the long-range boundary order is lost\, instead\, the order parameter correlation function decays as a power of log r. For N > Nc there is no fixed point with order parameter correlations decaying slower than power law. I’ll discuss how these findings compare to recent Monte-Carlo studies of classical and quantum spin models with SO(3) symmetry. Based on arXiv:2009.05119.
URL:https://physics.unc.edu/event/quantum-many-body-days-s-sachdev-m-metlitski/
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