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X-ORIGINAL-URL:https://physics.sciences.ncsu.edu
X-WR-CALDESC:Events for Department of Physics and Astronomy
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20241004T093000
DTEND;TZID=America/New_York:20241004T233000
DTSTAMP:20240904T174343Z
CREATED:20240904T174343Z
LAST-MODIFIED:20240904T174343Z
UID:51454-1728034200-1728084600@physics.sciences.ncsu.edu
SUMMARY:Preliminary Exam - Erin Crites
DESCRIPTION:Photothermal heating with nanoparticles: enhancing electrical conductivity in composites and water vapor formation in hydrogels
URL:https://physics.sciences.ncsu.edu/event/preliminary-exam-erin-crites/
LOCATION:Riddick 415\, 2401 Stinson Drive\, Raleigh\, NC\, 27695\, United States
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20241007T160000
DTEND;TZID=America/New_York:20241007T170000
DTSTAMP:20241007T142437Z
CREATED:20241007T142437Z
LAST-MODIFIED:20241007T142437Z
UID:51523-1728316800-1728320400@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Anton Malko
DESCRIPTION:Speaker: Anton Malko\nTitle: Heralded Photons and Stimulated Emission Using Colloidal Semiconductor Quantum Shells\n\nAbstract: Spherically shaped semiconductor nanoplatelets\, called quantum shells (QSs) have recently attracted considerable attention as they exhibit strongly suppressed Auger recombination\, ultralong biexciton (BX) lifetimes and broad gain bandwidth. However\, no applications that demonstrate true lasing action using QSs in optical cavity configurations have been shown yet. Here\, we design distributed feedback (DFB) cavities using lithographically defined SiO2 nanopillar arrays etched on Si substrates and filled with close-packed QS films. Using only one QSs size (i.e.\, confinement)\, we demonstrate emission coupling and narrowband lasing across a wide spectral range\, from single exciton (X) to multiple exciton (MX) transitions. The record low lasing threshold results from almost completely impeded Auger recombination and low optical losses in the nanopillar cavity. Tuning of the lasing emission wavelength shows an excellent agreement with calculations as an array period is continuously varied\, while maintaining the mode confinement and quality (Q) factors.\nOn the other hand\, quantum information processing demands efficient quantum light sources (QLS) capable of producing high-fidelity single photons or entangled photon pairs. While colloidal semiconductor nanoparticles have long been thought for the purpose\, they generally suffer from broader linewidths and unstable emissions. This leads to spectrally inseparable emissions from X and BX states\, complicating the production of single photons and triggered photon pairs. We demonstrate that QSs achieve significant spectral separation (~ 75-80 meV) and long temporal stability\, enabling the observation of BX-X bunching and emission of photon pairs for over 200 seconds\, with minimal overlap between emissive features. The X-BX distinguishability allows for an in-depth theoretical characterization of cross-correlation strength\, placing it in perspective with photon pairs of epitaxial counterparts. \n 
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-anton-malko/
LOCATION:Riddick 301\, 2401 Stinson Drive\, Raleigh\, NC\, 27695\, United States
CATEGORIES:Colloquia,In The Department
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20241010T120000
DTEND;TZID=America/New_York:20241010T130000
DTSTAMP:20240925T182521Z
CREATED:20240925T182521Z
LAST-MODIFIED:20240925T182521Z
UID:51511-1728561600-1728565200@physics.sciences.ncsu.edu
SUMMARY:CMB Seminar: James Sellers
DESCRIPTION:Title and abstract details are forthcoming.
URL:https://physics.sciences.ncsu.edu/event/cmb-seminar-james-sellers/
LOCATION:Bureau of Mines 201
CATEGORIES:CMB Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20241017T120000
DTEND;TZID=America/New_York:20241017T130000
DTSTAMP:20241016T205025Z
CREATED:20241008T200016Z
LAST-MODIFIED:20241016T205025Z
UID:51536-1729166400-1729170000@physics.sciences.ncsu.edu
SUMMARY:CMB Seminar: Allyson Sgro
DESCRIPTION:Title: Understanding the emergence of microbial collective behaviors \n\nAbstract: Groups of cells of all kinds work together as part of multicellular behaviors ranging from collective migration to development. These behaviors are coordinated at the level of single cells\, where information about other cells and the environment are encoded in intracellular signaling dynamics that then drive cellular-level behaviors. We face two challenges in understanding how these complex behaviors are coordinated. First\, linking these signals and cellular-level behaviors to observed population-wide behaviors is challenging because it requires bridging size- and time-scales. Second\, because behaviors are coordinated via information cells can sense locally and this\ninformation is shaped by their environments\, it is important to interrogate these behaviors in their natural contexts. \nTo address these challenges\, we focus on a cellular slime mold\, Dictyostelium discoideum\, that uses a biochemical environmental signal during starvation to\ncoordinate aggregation into multicellular groups for continued survival. To better understand the signaling dynamics required for coordinating behavior\, we take a joint\ntheory-experiment approach where we interrogate mathematical models of how these biochemical signaling dynamics could potentially drive coordinated behaviors with\nexperimental data. Our work suggests several key features of signaling networks are important to robustly coordinate collective multicellular behaviors. To identify how\nnatural environments shape coordination and thus behaviors\, we have designed a naturalistic soil model environment where we can visualize how environments interact\nwith different types of cells to affect collective outcomes. Our current findings suggest that the single-cell and population-wide signaling behaviors that coordinate\ndevelopment are robust in highly complex\, three-dimensional environments\, and that there are also other important cellular properties we do not yet fully understand\nrequired for success in nature. \n 
URL:https://physics.sciences.ncsu.edu/event/cmb-seminar-allyson-sgro/
LOCATION:Bureau of Mines 201
CATEGORIES:CMB Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20241021T160000
DTEND;TZID=America/New_York:20241021T170000
DTSTAMP:20241018T143854Z
CREATED:20241018T143854Z
LAST-MODIFIED:20241018T143854Z
UID:51580-1729526400-1729530000@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Ibou Bah
DESCRIPTION:Title: Topological Stars and Gravity \nAbstract: In this colloquium\, I will discuss aspects of microscopic degrees of freedom of gravity and the physical motivation of quantum gravity. While the generic states are quantum mechanical\, our goal will be to understand a class of them that are coherent enough to admit classical descriptions in Einstein gravity. The existence of these states requires topological structures in spacetime that follow from the dynamics of compact extra dimensions. They behave as ultra-compact objects\, dubbed topological stars\, which can also model microscopic degrees of freedom of black holes. I will discuss why it is interesting to understand such objects in a new age of black hole astrophysics and various aspects of their observational properties.
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-ibou-bah/
LOCATION:Riddick 301\, 2401 Stinson Drive\, Raleigh\, NC\, 27695\, United States
CATEGORIES:Colloquia,In The Department
ATTACH;FMTTYPE=image/jpeg:https://physics.sciences.ncsu.edu/wp-content/uploads/sites/461/2024/10/bah.jpg
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20241022T153000
DTEND;TZID=America/New_York:20241022T163000
DTSTAMP:20241021T165645Z
CREATED:20241021T165645Z
LAST-MODIFIED:20241021T165645Z
UID:51584-1729611000-1729614600@physics.sciences.ncsu.edu
SUMMARY:TNT Colloquium Fabio Magistrelli
DESCRIPTION:Title: Self-consistent predictions of nucleosynthesis and kilonovae from compact binary mergers \nAbstract: Understanding the details of r-process nucleosynthesis in binary neutron star mergers (BNSM) ejecta is key to interpreting kilonova observations and identifying the role of BNSMs in the origin of heavy elements. I will present a new tool to self-consistently study\, in a two-dimensional\, ray-by-ray approximation\, the radiation-hydrodynamic evolution of BNSM ejecta with an online nuclear network (NN). Starting from ab-initio numerical relativity profiles and including detailed r-process reactions\, nuclear heating effects and a local thermalization model\, we are able to predict the matter composition evolution and the kilonova light curves up to the days timescale. I will outline the significant impact that the NN coupling with the ejecta dynamics has on the element formation and kilonova emission. I will also discuss how self-consistently accounting for this coupling can improve the reliability of the predictions obtained with the common postprocessing methods. Moreover\, I will give an overview of some work-in-progress applications of our code\, from the analysis of new hundreds-of-millisecond NR simulations to its application to cosmochemistry and galactic chemical evolution.
URL:https://physics.sciences.ncsu.edu/event/tnt-colloquium-fabio-magistrelli/
CATEGORIES:Nuclear Theory Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20241025T090000
DTEND;TZID=America/New_York:20241025T110000
DTSTAMP:20241008T161826Z
CREATED:20241008T161826Z
LAST-MODIFIED:20241008T161826Z
UID:51534-1729846800-1729854000@physics.sciences.ncsu.edu
SUMMARY:Final Defense - Liqiang Hou
DESCRIPTION:Dark Matter Annihilation in Small Scales
URL:https://physics.sciences.ncsu.edu/event/final-defense-liqiang-hou/
LOCATION:Virtual
CATEGORIES:In The Department
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20241028T160000
DTEND;TZID=America/New_York:20241028T170000
DTSTAMP:20241018T144315Z
CREATED:20241016T210021Z
LAST-MODIFIED:20241018T144315Z
UID:51570-1730131200-1730134800@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Silke Henkes
DESCRIPTION:Title: Flow\, Fluctuate and Freeze: Modeling Collective Cell Motion Using Soft Active Matter \nAbstract: Active or living materials are made out of agents that can move on their own\, such as birds\, fish\, or artificial systems such as robots or active colloids. Cells are a core active material\, and the two-dimensional tissues known as epithelial cell sheets have a fundamental role in the developing embryo\, and also in adult tissues including the gut and the cornea of the eye. Soft and active matter provides a theoretical and computational framework to understand the mechanics and dynamics of these tissues.\nI will introduce the simplest useful class of models\, active brownian particles (ABPs)\, which incorporate uncoordinated active crawling over a substrate and mechanical interactions. Using this model\, I will show how the extended ‘swirly’ velocity fluctuations and the correlated motion of the edge seen in sheets on a substrate can be understood using a simple model that couples linear elasticity with disordered activity. We are able to quantitatively match experiments consisting of in-vitro epithelial cells.\nAdding a different source of activity\, cell division and apoptosis\, to such a model leads to a novel ‘self-melting’ dense fluid state. Together\, this model then allows us to explain what happens in a real biological system: The striking spiral flow pattern on the surface of the mouse cornea. It is in fact a steady-state flow pattern on a curved surface with a topological defect at the center where influx\, division\, extrusion and migration are finely balanced.
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-silke-henkes/
LOCATION:Riddick 301\, 2401 Stinson Drive\, Raleigh\, NC\, 27695\, United States
CATEGORIES:Colloquia,In The Department
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