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X-WR-CALDESC:Events for Department of Physics and Astronomy
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DTSTART:20210314T070000
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20220615T100000
DTEND;TZID=America/New_York:20220615T110000
DTSTAMP:20260511T000110
CREATED:20220615T142558Z
LAST-MODIFIED:20220615T142616Z
UID:19618-1655287200-1655290800@physics.sciences.ncsu.edu
SUMMARY:Grad Tea in Partner's II 1525
DESCRIPTION:
URL:https://physics.sciences.ncsu.edu/event/grad-tea-in-partners-ii-1525/
CATEGORIES:In The Department
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230201T160000
DTEND;TZID=America/New_York:20230201T170000
DTSTAMP:20260511T000110
CREATED:20230118T165105Z
LAST-MODIFIED:20230128T030453Z
UID:20287-1675267200-1675270800@physics.sciences.ncsu.edu
SUMMARY:Astro Candidate Talk
DESCRIPTION:Title: Circumgalactic Medium Dynamics are Crucial to Galaxy Evolution
URL:https://physics.sciences.ncsu.edu/event/astro-candidate-talk-5/
LOCATION:Riddick 301\, 2401 Stinson Drive\, Raleigh\, NC\, 27695\, United States
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230206T160000
DTEND;TZID=America/New_York:20230206T170000
DTSTAMP:20260511T000110
CREATED:20221205T125755Z
LAST-MODIFIED:20230131T170717Z
UID:20225-1675699200-1675702800@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Gregory B. McKenna
DESCRIPTION:Title: Extreme Stability in Organic Glasses: Challenges to the Kauzmann Paradox and the Idea of an Ideal Glass Transition \nAbstract: A major premise in many theories of glass formation in complex fluids is the concept of an ideal\, thermodynamic glass transition taking place at or near the Kauzmann temperature T K where the system entropy extrapolates to a zero value. This thermodynamically based T K is associated with the Vogel\, Fulcher\, Tammann temperature T VFT at which the relaxation time or the viscosity extrapolate to infinite values above zero Kelvin. At the same time\, it is known that many non-crystallizable materials\, especially polymers\, form glasses. This suggests that the importance of the Kauzmann paradox to glass formation may be problematic. Here we show results from two non-crystallizable ultra-stable glasses (evidenced by greatly reduced\nfictive temperatures T F ) that give new insights into the conundrum of the Kauzmann paradox. In the first instance we use vapor deposition to make an ultra-stable amorphous perfluoropolymer (CYTOP TM ) that shows a fictive temperature T F that is more than 60 K below the glass transition temperature T g and approximately 11 K below T VFT . The results also show (and validate) the potential of using the vapor deposition process to create extremely stable glasses even when the material to be deposited is a polymer. Examples of a similar amorphous perfluoropolymer (Teflon AF TM ) studied previously had suggested the possibility extreme stability in a vapor deposited polymer. The second instance uses length change dilatometry measurements on a 50-million-year-old amber from Fushun\, China. In this case direct measurements of the fictive temperature show that the material is not only ultra-stable\, but also that the TF is as much as 196 K below the T g \, i.e.\, over 100 K below T VFT . In addition to the dilatometry\, the experiments were conducted in such a fashion that the material dynamics were obtained for glasses having different fictive temperatures as a function of temperature\, fictive temperature and density. We find that the case in which the value of the test temperature T > T F \, confirms prior results that suggest non-diverging relaxation times even though this condition should give upper bounds to the relaxation times at any given temperature. In addition\, we find that the relaxation times for the condition when T=T F (which should be a state for which the volume is equal to the equilibrium liquid volume at the temperature of interest) are exponential in temperature and do not diverge\, though the times measured are in excess of yotta seconds (10 24 s). This is a striking difference from prior findings that suggest a change in dynamics from super-Arrhenius to Arrhenius behavior as one goes below the glass temperature T g . The implications of these findings will be discussed. \nHost: Laura Clarke
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-gregory-b-mckenna/
LOCATION:Riddick 301\, 2401 Stinson Drive\, Raleigh\, NC\, 27695\, United States
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230207T140000
DTEND;TZID=America/New_York:20230207T153000
DTSTAMP:20260511T000110
CREATED:20230131T215113Z
LAST-MODIFIED:20230131T215113Z
UID:20374-1675778400-1675783800@physics.sciences.ncsu.edu
SUMMARY:Preliminary Exam - Davey Dickson
DESCRIPTION:Quantifying the Efficiency of Roche Lobe Overflow in the Formation of Merging Black Hole Binaries
URL:https://physics.sciences.ncsu.edu/event/preliminary-exam-davey-dickson/
LOCATION:Riddick 400P
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20220615T100000
DTEND;TZID=America/New_York:20220615T110000
DTSTAMP:20260511T000110
CREATED:20220615T142558Z
LAST-MODIFIED:20220615T142616Z
UID:19618-1655287200-1655290800@physics.sciences.ncsu.edu
SUMMARY:Grad Tea in Partner's II 1525
DESCRIPTION:
URL:https://physics.sciences.ncsu.edu/event/grad-tea-in-partners-ii-1525/
CATEGORIES:In The Department
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230208T160000
DTEND;TZID=America/New_York:20230208T170000
DTSTAMP:20260511T000110
CREATED:20230118T165227Z
LAST-MODIFIED:20230205T160737Z
UID:20290-1675872000-1675875600@physics.sciences.ncsu.edu
SUMMARY:Quantum Candidate Talk
DESCRIPTION:Title: Non-Hermitian quantum dynamics near exceptional points \nAbstract: The second quantum revolution\, where quantum technologies are directly harnessed\, will realize an unprecedented advance in computation\, simulation\, sensing\, and communication. Currently\, quantum applications suffer from the dissipation of quantum systems due to their interactions with the environment. The undesired dissipation can become a valuable resource through careful bath engineering and provide novel functionalities in state preparation\, entanglement generation\, and error correction. My research focuses on harnessing non-Hermiticity—a special kind of dissipation that leads to nonunitary but coherent evolution—for quantum techniques. Non-Hermitian systems\, in general\, have complex energies and nonorthogonal eigenstates. Their unique characteristics appear at or near the non-Hermitian degeneracies\, also known as exceptional points (EPs). In this talk\, I will present our recent work on non-Hermitian dynamics of a superconducting qubit and highlight two striking features of EPs. One is the Riemann topology of complex energies near an EP that enables a new method to transfer quantum states via encircling the EP. The second is the enhanced response of EPs to perturbations. On one hand\, this property leads to enhanced decoherence for the non-Hermitian qubit\, yet I will describe how this enhancement can be leveraged in speeding up entanglement generation by proximity to EPs. \nHost: Dali Sun
URL:https://physics.sciences.ncsu.edu/event/quantum-candidate-talk/
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230213T160000
DTEND;TZID=America/New_York:20230213T170000
DTSTAMP:20260511T000110
CREATED:20221205T130748Z
LAST-MODIFIED:20230130T204002Z
UID:20228-1676304000-1676307600@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Elke-Caroline Aschenauer
DESCRIPTION:Title: The electron-ion collider — A world wide unique collider to unravel the mysteries of visible matter \nAbstract: Understanding the properties of nuclear matter and its emergence through the underlying partonic structure and dynamics of quarks and gluons requires a new experimental facility in hadronic physics known as the Electron-Ion Collider (EIC). The EIC will address some of the most profound questions concerning the emergence of nuclear properties by precisely imaging gluons and quarks inside protons and nuclei such as their distributions in space and momentum\, their role in building the nucleon spin and the properties of gluons in nuclei at high energies. In January 2020 the EIC received CD-0 and Brookhaven National Laboratory was selected as site\, and June 2021 CD-1. This presentation will give highlights on the EIC science program\, introduce the experimental equipment and its integration into the accelerator and give the status of the EIC project\, as well as what are the next major steps. \nHost: Vladimir Skokov
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-elke-caroline-aschenauer/
LOCATION:Riddick 301\, 2401 Stinson Drive\, Raleigh\, NC\, 27695\, United States
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20220615T100000
DTEND;TZID=America/New_York:20220615T110000
DTSTAMP:20260511T000110
CREATED:20220615T142558Z
LAST-MODIFIED:20220615T142616Z
UID:19618-1655287200-1655290800@physics.sciences.ncsu.edu
SUMMARY:Grad Tea in Partner's II 1525
DESCRIPTION:
URL:https://physics.sciences.ncsu.edu/event/grad-tea-in-partners-ii-1525/
CATEGORIES:In The Department
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230215T160000
DTEND;TZID=America/New_York:20230215T170000
DTSTAMP:20260511T000110
CREATED:20230118T165341Z
LAST-MODIFIED:20230205T161315Z
UID:20292-1676476800-1676480400@physics.sciences.ncsu.edu
SUMMARY:Quantum Candidate Talk
DESCRIPTION:Title: In pursuit of entanglement: XXZ interactions for spin-squeezing in atomic and solid-state spin ensembles \nAbstract: Controlling many-body entanglement promises to yield both fundamental insights and practical advances. In particular\, generating squeezed states for entanglement-enhanced metrology is an important near-term application of quantum systems. In past work\, squeezing has been achieved in a clean\, controlled setting using all-to-all Ising interactions between ultracold atoms in an optical cavity. By contrast\, optically-addressable spin defects in solids\, such as the nitrogen-vacancy center in diamond\, are far more practical and versatile sensors\, but it is not known whether the requisite ingredients for generating and detecting squeezing are attainable in this platform. \nIn this talk\, I will discuss two complementary approaches for generating squeezed states using XXZ interactions. The first approach centers around a cavity QED platform designed to realize programmable\, nonlocal spin-spin couplings. Specifically\, we implement an all-to-all XXZ Hamiltonian with tunable anisotropy\, strength\, and sign. Images of the resulting magnetization dynamics show that XXZ interactions protect spin coherence against spatial inhomogeneities\, which may enhance the robustness of future spin-squeezing protocols. \nThe robustness of the XXZ model against disorder opens the door to squeezing via long-range dipolar interactions within an ensemble of spin defects in diamond\, for which we identify and achieve the key required ingredients: (i) a theory that elucidates if and how power-law XXZ interactions generate squeezing; (ii) a two-dimensional ensemble of strongly-interacting\, optically-polarizable spins; (iii) methods for detecting squeezing despite significant technical noise. \n\nHost: Sharonda LeBlanc
URL:https://physics.sciences.ncsu.edu/event/quantum-candidate-talk-2/
LOCATION:Riddick 301\, 2401 Stinson Drive\, Raleigh\, NC\, 27695\, United States
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230217T110000
DTEND;TZID=America/New_York:20230217T123000
DTSTAMP:20260511T000110
CREATED:20230206T172051Z
LAST-MODIFIED:20230206T172051Z
UID:20408-1676631600-1676637000@physics.sciences.ncsu.edu
SUMMARY:Preliminary Exam - Ethan Blalock
DESCRIPTION:Final Background Model for the Majorana Demonstrator
URL:https://physics.sciences.ncsu.edu/event/preliminary-exam-ethan-blalock/
LOCATION:Riddick 202
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230220T160000
DTEND;TZID=America/New_York:20230220T170000
DTSTAMP:20260511T000110
CREATED:20221205T131546Z
LAST-MODIFIED:20230117T125608Z
UID:20231-1676908800-1676912400@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Peng Xiong
DESCRIPTION:Title: Physics and applications of semiconductor/molecular hybrid nanostructures \nAbstract: Integration of organic molecules with inorganic semiconductors holds vast potential for fundamental physics studies and device applications. For instance\, surface functionalization with organic molecules can afford semiconductor devices unusual\nfunctionalities such as molecular recognition\, which can be harnessed for biomolecular sensing and bottom-up assembly of semiconductor nanostructures. On the other hand\, organic molecules can also be utilized as means of modulating and enhancing electronic characteristics of semiconductor devices\, and even serve as active components for producing novel charge and spin transport effects. In this talk\, I will present several examples of research from an interdisciplinary effort focusing on the fabrication and studies of various semiconductor/molecular hybrid nanostructures\, with an eye towards both demonstrating new device functions and discovering new physics. \nHost: Dali Sun
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-peng-xiong/
LOCATION:Riddick 301\, 2401 Stinson Drive\, Raleigh\, NC\, 27695\, United States
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20220615T100000
DTEND;TZID=America/New_York:20220615T110000
DTSTAMP:20260511T000110
CREATED:20220615T142558Z
LAST-MODIFIED:20220615T142616Z
UID:19618-1655287200-1655290800@physics.sciences.ncsu.edu
SUMMARY:Grad Tea in Partner's II 1525
DESCRIPTION:
URL:https://physics.sciences.ncsu.edu/event/grad-tea-in-partners-ii-1525/
CATEGORIES:In The Department
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230222T160000
DTEND;TZID=America/New_York:20230222T170000
DTSTAMP:20260511T000110
CREATED:20230118T170626Z
LAST-MODIFIED:20230206T024155Z
UID:20302-1677081600-1677085200@physics.sciences.ncsu.edu
SUMMARY:Quantum Candidate Talk
DESCRIPTION:Title: Superconducting electronics with graphene heterostructures \nAbstract: Heterostructures of graphene and boron nitride offer unique opportunities for superconducting\nelectronics because of their ballistic transport properties and highly transparent edge-contacts. They provide a convenient medium to develop devices where superconductivity coexists with other electronic phases\, or to engineer more complex junctions where multiple superconducting electrodes are strongly coupled through the same graphene channel.\nMultiterminal junctions\, in particular\, are appealing because the increased complexity of their superconducting phase space results in a variety of nonlinear dynamics phenomena\, which presents opportunities for novel device functionalities. Moreover\, it was recently proposed that driven multiterminal junctions could be used to engineer Floquet states\, and that the phase-dependent energy spectrum of their bound-states could yield insights into topological materials.\nIn this talk\, I will discuss the transport properties of graphene-based multiterminal junctions driven out-of-equilibrium. I will first describe how to control the different superconducting pathways through these devices\, and how they can be used as highly-tunable and efficient superconducting triodes\, where a supercurrent may only flow in one direction. I will then show\nhow phase synchronization effects can result in stable supercurrents even at finite voltage biases. Finally\, we will discuss the inverse AC Josephson effect in multiterminal junctions\, and see how competing phase-locked states result in fractional Shapiro voltage steps. \nHost: Vladimir Skokov
URL:https://physics.sciences.ncsu.edu/event/quantum-candidate-talk-5/
LOCATION:Riddick 301\, 2401 Stinson Drive\, Raleigh\, NC\, 27695\, United States
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230223T133000
DTEND;TZID=America/New_York:20230223T143000
DTSTAMP:20260511T000110
CREATED:20230217T201529Z
LAST-MODIFIED:20230217T201817Z
UID:20480-1677159000-1677162600@physics.sciences.ncsu.edu
SUMMARY:CMB Seminar - Prof. Itai Cohen
DESCRIPTION:Prof. Itai Cohen\nCornell University\, Physics Department\n\nTITLE: Electronically Integrated Microscopic Robots \n\nABSTRACT: What would we be able to do if we could build electronically\nintegrated machines the at a scale of 100 microns? At this scale\,\nsemiconductor devices are small enough that we could put the\ncomputational power of the spaceship Voyager onto a machine that\ncould be injected into the body. Such robots could have on board\ndetectors\, power sources\, and processors that enable them to\nsense\, interact\, and control their local environment. In this talk I\nwill describe several cutting edge technologies we are developing\nto achieve this vision.\n\nNC State Seminar: February 23 2023; 1:30 pm in EB-1 2015
URL:https://physics.sciences.ncsu.edu/event/cmb-seminar-prof-itai-cohen/
LOCATION:EB-1 2015
CATEGORIES:CMB Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20230227T160000
DTEND;TZID=America/New_York:20230227T170000
DTSTAMP:20260511T000110
CREATED:20230209T180722Z
LAST-MODIFIED:20230209T180722Z
UID:20422-1677513600-1677517200@physics.sciences.ncsu.edu
SUMMARY:Physics Faculty Meeting
DESCRIPTION:
URL:https://physics.sciences.ncsu.edu/event/physics-faculty-meeting-21/
LOCATION:Riddick 301\, 2401 Stinson Drive\, Raleigh\, NC\, 27695\, United States
CATEGORIES:In The Department
END:VEVENT
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