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DTSTART;TZID=America/New_York:20200909T160000
DTEND;TZID=America/New_York:20200909T170000
DTSTAMP:20260416T204748
CREATED:20200708T194425Z
LAST-MODIFIED:20200904T184704Z
UID:17033-1599667200-1599670800@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Carla Fröhlich
DESCRIPTION:Title: Nucleosynthesis and other Messengers from Supernovae \nAbstract: Core-collapse supernovae are rich multi-physics laboratories. Originating from the gravitational collapse of massive stars\, they are a key site of element synthesis and the birthplace of neutron stars and black holes.  \nThese supernovae are a source of gravitational waves\, they emit copious quantities of neutrinos\, and they put on a bright electromagnetic display. However\, numerical simulations of core-collapse supernovae remain a challenging and computationally expensive problem. This is an open question in itself\, but also affects the prediction of observable signatures\, such as nucleosynthesis or light curves. \nIn this talk\, I will present the research undertaken here at NCSU and the contributions we have made to the modeling of supernovae and nucleosynthesis. I will focus on the multi-messenger predictions from nuclei to electromagnetic signals to neutrinos from our models\, and on the novel pipeline we have developed for this. I will also present the first hydrodynamic core-collapse supernova simulation which simultaneously includes neutrino flavor transformations. I will conclude by discussing some ongoing and future projects. \nHost:  Department of Physics
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-carla-frohlich/
LOCATION:NC
CATEGORIES:College of Sciences Calendar,Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200914T160000
DTEND;TZID=America/New_York:20200914T170000
DTSTAMP:20260416T204748
CREATED:20200708T194340Z
LAST-MODIFIED:20200910T121017Z
UID:17025-1600099200-1600102800@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Divine P. Kumah
DESCRIPTION:Title: Emergent Phenomena at Transition Metal Oxide Interfaces \nAbstract: Transition Metal Oxides (TMOs) exhibit a wide range of physical properties including high-temperature\nsuperconductivity\, ferroelectricity\, ferromagnetism and metal-insulator transitions. While these physical properties are understood in the bulk forms of these materials\, open questions remain with regards to the effects reduced dimensionality and quantum confinement and the effect of electronic\, orbital\, spin and structural interactions at heterointerfaces.  \nIn this talk\, a combination of atomic-scale materials synthesis\, synchrotron X-ray high-resolution diffraction and spectroscopy\, temperature-dependent transport and magnetometry\, high resolution electron microscopy and first-principles density functional theory are used to elucidate the interplay between structural and electronic degrees of freedom at TMO interfaces. \nFirst\, we show that magnetic and orbital degrees of freedom are coupled to structural interactions at the interfaces between atomically-thin TMO films. We demonstrate the stabilization of robust ferromagnetism in sub-nanometer thick LaSrMnO 3 films. We show that polar structural distortions at LSMO interfaces lead to magnetically ‘dead’ ultra-thin layers. By suppressing these polar distortions using iso-valent and iso-structural LaSrCrO 3 spacer layers\, we show that ferromagnetic ordering is restored in LaSrCrO 3 / LaSrMnO 3 / LaSrCrO 3 heterostructures. Additionally\, we show that the degeneracy of the transition metal d orbitals can be controlled by epitaxial strain leading to competition between ferromagnetic and antiferromagnetic instabilities.[1][2] Secondly\, we demonstrate the realization of a high mobility two-dimensional conducting interface between a polar anti-ferromagnet\, LaCrO 3 (LCO) and\nnon-polar SrTiO 3 (STO).[3] Here\, the parent materials are insulators\, however\, structural and electronic interactions at the LCO/STO interface lead to the formation of an electron gas confined to the interface. \nThese results demonstrate the strong correlation between the atomic-scale structural properties of 2D materials and their electronic and magnetic ground states with important implications for discovering and understanding quantum materials. \n[1] Koohfar et. al.\, npj Quantum Materials 4 (1)\, 25 (2019)\n[2] Koohfar et. al.\, Physical Review B 101 (6)\, 064420 (2020)\n[3] Al-Tawhid et. al.\, AIP advances 10 (4)\, 045132 (2020)\n[4] Al-Tawhid et. al. of Vacuum Science & Technology A 37\, 021102 (2019) \nHost:  Department of Physics
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-divine-kumah/
LOCATION:NC
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200921T160000
DTEND;TZID=America/New_York:20200921T170000
DTSTAMP:20260416T204748
CREATED:20200708T194538Z
LAST-MODIFIED:20200907T170430Z
UID:17035-1600704000-1600707600@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Chris Monahan
DESCRIPTION:Title: Searching for New Physics with Strong QCD \nAbstract: The Standard Model of Particle Physics\, the mathematical framework that describes the basic building blocks of the visible Universe\, has been enormously successful. But we know that it is incomplete: it doesn’t explain the origin of neutrino masses\, for example\, nor does it incorporate gravity. In fact\, the Standard Model explains only 5% of the current energy density of the Universe! The Large Hadron Collider (LHC) has also been hugely successful – discovering the long-expected Higgs particle and greatly refining our knowledge of the Standard Model. But the LHC has been marked by the lack of direct experimental signatures of new fundamental particles. So where is all the new physics hiding? I will discuss the role that lattice quantum chromodynamics (QCD) plays in attempting to answer this question. In particular\, I will highlight two areas in which lattice QCD can help us search for new physics\, through precision tests of the Standard Model. \nHost:  Vladimir Skokov
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-chris-monahan-william-mary-university/
LOCATION:NC
CATEGORIES:College of Sciences Calendar,Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200923T160000
DTEND;TZID=America/New_York:20200923T170000
DTSTAMP:20260416T204748
CREATED:20200708T194626Z
LAST-MODIFIED:20200921T180313Z
UID:17037-1600876800-1600880400@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Matthew Green
DESCRIPTION:Title: Neutrinos & Nuclei: Using Nuclear Systems to Probe Fundamental Properties of Neutrinos \nAbstract: Despite being the second-most abundant standard model particles in our Universe\, there is much remaining to learn about neutrinos\, and as such these particles offer avenues for exploration of physics beyond the Standard Model. Measurements of their properties and interactions address key questions in: particle physics (Why are neutrino masses so low? Is lepton number conserved?); cosmology (What is the cause of the abundance of matter over antimatter in our Universe?); and nuclear physics (How are neutrons distributed in nuclear matter?). The atomic nucleus proves to be an excellent laboratory for studying the properties of neutrinos\, and in this talk 2 nuclear system probes of fundamental neutrino physics will be discussed: Neutrinoless Double-Beta Decay (0vββ) and Coherent Elastic Neutrino-Nucleus Scattering (CEvNS). The NCSU Experimental Neutrino Physics Group exploits the excellent energy resolution of high-purity germanium detectors to measure both. The Majorana Demonstrator\, an experiment aimed at detecting 0vββ in an array of p-type point contact (PPC) germanium detectors\, has been operating in the Sanford Underground Research Facility for the past several years\, and has helped pave the way for a next-generation germanium-based 0vββ effort known as LEGEND. The detector technology developed in part to support the LEGEND program is being leveraged by the COHERENT collaboration to measure CEvNS at Oak Ridge National Laboratory’s Spallation Neutron Source. I will discuss the physics of 0vββ\, CEvNS\, and the status and possibilities of these experimental efforts. \nHost:  Department of Physics
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-matt-green/
LOCATION:NC
CATEGORIES:College of Sciences Calendar,Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200928T160000
DTEND;TZID=America/New_York:20200928T170000
DTSTAMP:20260416T204748
CREATED:20200708T194706Z
LAST-MODIFIED:20200921T180455Z
UID:17039-1601308800-1601312400@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: James Freericks
DESCRIPTION:Title: Operator Mechanics: A New Form of Quantum Mechanics without Waves or Matrices \nAbstract: Quantum mechanics was created with the matrix mechanics of Heisenberg\, Born\, and Jordan. Schroedinger’s wave mechanics shortly followed and allowed for simpler and more powerful calculations. Both Pauli and Dirac introduced a formulation of quantum mechanics based on operators and commutation relations\, but it was never fully developed in the 1920’s. Instead\, Schroedinger formulated the operator approach with his factorization method\, which later was adopted by the high-energy community as supersymmetric quantum mechanics. \nIn this talk\, I will explain how one can formulate nearly all of quantum mechanics algebraically by a proper use of the translation operator on top of Schroedinger’s factorization method. I will give examples of how one can compute spherical harmonics algebraically\, how one can find harmonic oscillator wavefunctions\, and will even describe an operator-based derivation of the wave functions of Hydrogen. I will end with a proposal for a novel way to teach quantum mechanics\, focusing first on conceptual ideas related to superposition\, projective measurements\, and entanglement. Then developing more conventional topics like spin\, harmonic oscillator\, angular momentum\, interacting spin models\, central potentials\, particles in a box and so on.\nThis is the subject of a book in progress entitled Quantum Mechanics without Calculus. \nHost:  Lex Kemper
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-james-freericks-georgetown-university/
LOCATION:NC
CATEGORIES:College of Sciences Calendar,Colloquia
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