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DTSTART;TZID=America/New_York:20210301T160000
DTEND;TZID=America/New_York:20210301T170000
DTSTAMP:20260415T154929
CREATED:20210115T202611Z
LAST-MODIFIED:20210226T153654Z
UID:17613-1614614400-1614618000@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Michele Fumagalli
DESCRIPTION:Title: Shedding light on gas around galaxies across cosmic time \nAbstract: The evolution of galaxies is closely connected to the gas environment in which galaxies reside. Traditionally\, this tenuous gas that cycles in and out of galaxies has been studied primarily in absorption using quasar spectroscopy. The deployment of large integral field spectrographs at 8 meter telescopes\, and in particular MUSE at VLT\, is now transforming our view of the interplay between the ambient gas and galaxies by enabling spectroscopy in emission at very low surface brightness. In this talk\, I will present highlights from multiple large programmes that are starting to shed light onto the link between gas and galaxies as a function of cosmic time.\nHost: Rongmon Bordoloi
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-michele-fumagalli/
LOCATION:NC
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210308T160000
DTEND;TZID=America/New_York:20210308T170000
DTSTAMP:20260415T154930
CREATED:20210115T203326Z
LAST-MODIFIED:20210308T182753Z
UID:17615-1615219200-1615222800@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium:  Celine Peroux
DESCRIPTION:Title:The Cosmic Baryon and Metal Cycles \nAbstract: Characterising the relationship between stars\, gas\, and metals in galaxies is a critical component of understanding the cosmic baryon cycle. This review compiles contemporary censuses of the baryons in collapsed structures and their chemical make-up and dust content. The HI mass density of the Universe as well as new observations of molecular hydrogen together provide fresh clues on the cosmic cold gas depletion timescale and the cause of the star-formation history decline at low-redshift. The census of the metals in various phases from z=0 to z~5 permits to revisit the 20-year old “missing metals problem”. Lastly\, I will present new calculations of the cosmological dust mass density in the neutral gas up to z~5. Together\, the cosmic evolution of baryons\, metals\, and dust is —in the broadest strokes— now fairly secure. \nHost: Rongmon Bordoloi
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-celine-peroux/
LOCATION:NC
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210315T160000
DTEND;TZID=America/New_York:20210315T170000
DTSTAMP:20260415T154930
CREATED:20210115T203658Z
LAST-MODIFIED:20210312T183815Z
UID:17617-1615824000-1615827600@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Daniel Ayangeakaa
DESCRIPTION:Title: Nuclear Structure and the search for neutrinoless double beta decay (0νββ) in 76Ge \nAbstract: Neutrinoless double-beta (0νββ) decay is one of the most promising experimental phenomena capable of probing the fundamental properties of the neutrino. The observation of this hypothetical weak-interaction process would signal a violation of total lepton number conservation and establish the Majorana nature of the neutrino. It will also provide experimental access to the absolute neutrino mass scale\, provided that the nuclear matrix elements (NME) mediating the decay are reliably known. However\, results of nuclear structure calculations of the NMEs are found to differ by up to a factor of 3\, depending on the methodology. Experimental input from a nuclear structure perspective to constrain these calculations is\, thus\, essential as this would allow models to be selected or developed based on reproducible benchmarking criteria. In this talk\, I will present results from a high-precision Coulomb excitation measurement aimed at providing experimental data as input to theoretical models used in calculating 0νββ NME. The talk will focus primarily on the electromagnetic properties of low-lying states in 76Ge\, a nucleus with one of the highest 0νββ discovery potential.  The experiment was performed at the ATLAS facility at the Argonne national laboratory using the advanced gamma-ray tracking array\, GRETINA\, and the charged-particle detector\, CHICO2. The influence of the axial asymmetry parameter on the shape of this nucleus along with the results of multiconfiguration mixing calculations carried out within the framework of the triaxial rotor model will be highlighted. Most importantly\, new experimental evidence characterizing the precise nature of triaxial deformation in 76Ge will be presented. The results will also be compared with state-of-the-art shell model calculations and recently obtained (n\,n’γ) data\, with emphasis on demonstrating the importance of nuclear deformation in determining the nuclear decay matrix elements relevant to neutrinoless double-beta decay (0νββ). \nHost: Sharonda LeBlanc
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-daniel-ayangeakaa/
LOCATION:NC
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210322T160000
DTEND;TZID=America/New_York:20210322T170000
DTSTAMP:20260415T154930
CREATED:20210115T204628Z
LAST-MODIFIED:20210319T152416Z
UID:17619-1616428800-1616432400@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium:  Giulia Galli
DESCRIPTION:Title: Quantum Science and Technology with Defects: Predictions and Design \nAbstract: We present computational strategies based on quantum mechanical calculations\, aimed at predicting materials with desired characteristics for quantum sensing and quantum computations. We discuss results for color centers in three- and two-dimensional semiconductors and insulators\, obtained using both classical and near-term quantum computers. \nHost: Dali Sun
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-giulia-galli/
LOCATION:NC
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210329T160000
DTEND;TZID=America/New_York:20210329T170000
DTSTAMP:20260415T154930
CREATED:20210115T205018Z
LAST-MODIFIED:20210329T122312Z
UID:17624-1617033600-1617037200@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Luisa Whittaker-Brooks
DESCRIPTION:Title: Designer Organic-Inorganic Interfaces for Coherent Charge and Spin Transfer \nAbstract: Organic-inorganic interfaces while highly desirable for a host of applications\, present several challenges that remain unresolved\, including the ability to control the assembly of the organic and inorganic components and interfaces at the molecular level (orientation and mode of attachment)\, matching of phonon band structure in inorganics with discrete vibrations within the molecule\, and tuning energetic offsets for effective charge and spin transfer. Each of these parameters ultimately govern charge transport\, the preservation of coherence\, and energy transfer. \nIn this talk\, I will discuss fundamental guidelines for the design of well-defined organic-inorganic heterostructured materials with controlled morphology and interfaces that serve as conduits for deterministic and coherent spin and charge transfer. I will divide my talk into two different sub-topics\, i.e.\, (1) how matching phonon structure across interfaces through control of mode and site of attachment of molecules to surfaces allow for efficient coherent charge transfer and (2) how topologically protected electronic states can be defined by 2D assembly of pi-conjugated molecules and layered organic-inorganic hybrid materials on surfaces for spin-coherent electronic transport. Here\, I will emphasize the role that dimensionality plays in modulating the spin and charge properties of organic-inorganic hybrid structures. The common thread between these two sub-topics is the fundamental understanding of energy and charge transfer at the interfaces of organic-inorganic hybrid materials to control charge (spin) injection\, transport\, manipulation\, and detection with implications for photovoltaics\, energy storage\, quantum electronics\, and spintronics. \nHost: Dali Sun
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-luisa-whittaker-brooks/
LOCATION:NC
CATEGORIES:Colloquia
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