1. A&S Wired: Measuring Science with an iPad

    02:11

    from UK College of Arts & Sciences / Added

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    Mike Cavagnero, the Chair of the Department of Physics and Astronomy, was one of the initial faculty members to teach a class in A&S Wired in Fall of 2011. His class was titled Measuring Science. This video showcases the students' final projects, in which they used their iPads as a tool to help in their research, data and analysis.

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    • Dean's Channel: Figuring Physics with Mike Cavagnero

      07:24

      from UK College of Arts & Sciences / Added

      83 Plays / / 0 Comments

      In part two of the Dean's interview with Mike Cavagnero, the Chair of Physics and Astronomy discusses the role of the department on campus and the possibilities and excitement of where the discipline may be headed.

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      • Kirill Shtengle - Non-Abelian Anyons

        01:10:58

        from UK College of Arts & Sciences / Added

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        University of Kentucky College of Arts and Sciences Department of Physics and Astronomy Colloquium. A presentation on Non-Abelian Anyons by Kirill Shtengle.

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        • Unveiling the Mystery of Mass

          01:32:01

          from UK College of Arts & Sciences / Added

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          One of the prime reasons the Large Hadron Collider (LHC) was built is to resolve the question of how particles acquire their mass. While it is very simple to measure particle masses and we have a model -- the Standard Model of Particle Physics -- which explains quite accurately all presently available measurements the seemingly trivial mechanism of how particle acquire their mass remains a mystery. The Standard Model invokes a new scalar gauge field to resolve this mystery but we have until recently not been able to find experimental evidence for its existence. On July 4, 2012, the CMS and ATLAS experiments have announced the discovery of a new Higgs-like particle at a mass of about 125 GeV. I will review our knowledge about the Higgs boson before the LHC started, discuss the discovery and the most recent updates from the LHC experiments.

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          • Observation of the thermal Casimir effect and new limits on non-Newtonian forces in the micrometer range

            01:09:08

            from UK College of Arts & Sciences / Added

            40 Plays / / 0 Comments

            Quantum theory predicts the existence of the Casimir force between macroscopic bodies, a force arising from the zero-point energy of electromagnetic field modes around them. I will report the experimental observation of the thermal Casimir force between two gold plates, due to thermal rather than quantum fluctuations of the electromagnetic field at room-temperature. The thermal Casimir force dominates over the quantum force for separations greater than a micrometer. We use our measurements to place new upper bounds on short-range exotic forces, arising, for example, in quantum gravity theories with extra dimensions.

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            • Controlled Magnetic Reversal and Emergent Metamagnetism in Permalloy Films Patterned into Artificial Quasicrystals

              01:11:31

              from UK College of Arts & Sciences / Added

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              Dr. Lance Delong University of Kentucky Ferromagnetic (FM) thin films patterned into periodic lattices of nanoscale holes or dots are candidated for UHD data storage media, an drelated wire network patterns are of fundamental interest as examples of controlled phase transitions in "artificial spin ice". Our recent Physical Review Letter reported an experimental study of the static and dynamic magnetic properties of FM permalloy thin films patterned as Penrose P2 (quasicrystal) tilings that exhibit long-range order, but aperiodic translational symmetry. Our DC magnetization and ferromagnetic resonance data constitute, we believe, the first experimental study of th espin wave dynamics of an artificial FM quasicrystalline thin film. Ground-breaking efforts were required to both pattern and deposit the sample film materials, and to execute large-scale numerical simulations of their static and dynamic behavior. This work demonstrates a new method for controlling the evolution of FM domain walls and spin wave spectra in magnetic media, in spite of a lack of periodic symmetry in an artificial quasicrystalline pattern. Simulations reveal a remarkably controlled sequence of reversals of individual film segments located on sublattices of the quasicrystal pattern, which may signal the occurence of true metamagnetic phase transitions in larger-area samples. These results directly imply FM films patterned as Penrose P2 tilings constitute a novel class of magnonic crystals whose magnon frequency dispersion and physical properties were heretofore unknown.

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              • Colloquium: Topological Surface States in Topological Insulators, Superconductors and Beyond

                01:11:29

                from UK College of Arts & Sciences / Added

                153 Plays / / 0 Comments

                Topological Surface States in Topological Insulators, Superconductors and Beyond M Zahid Hasan, Dept of Physics, Princeton University Bulk Topological Insulators are a new phase of electronic matter which realizes a non-quantum-Hall-like topological state in the bulk matter and unlike the quantum Hall liquids can be turned into superconductors. In this talk, I will first review the basic theory of topological matter and experimental probes that reveal topological order. I will discuss experimental results that demonstrate the fundamental properties of topological insulators such as spin-momentum locking, non-trivial Berry’s phases, mirror Chern number, absence of backscattering or no U-turn rule, protection by time-reversal symmetry and the existence of room temperature topological order (at the level of M.Z.H and C.L. Kane, Rev. of Mod. Phys., 82, 3045 (2010)). I will then discuss the possible exotic roles of broken symmetry phases such as superconductivity and magnetism in doped topological insulators and their potential device applications in connection to our recent results as well as outline the emerging research frontiers of the field as a whole. Time permitting, I will also present experimental results on a new class of topological insulators beyond the Kane-Mele Z2 theory.

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                • Discovery of New and Old Thermoelectrics using First Principles Methods

                  58:08

                  from UK College of Arts & Sciences / Added

                  25 Plays / / 0 Comments

                  Dr. David Singh Oak Ridge National Labs There is increasing interest in thermoelectric materials motivated in part by recent progress and in part by the potential of these materials in various energy technologies. Thermoelectric performance is a multiply contra-indicated property of matter. For example, it requires (1) high thermopower and high electrical conductivity, (2) high electrical conductivity and low thermal conductivity and (3) low thermal conductivity and high melting point. The keys to progress are finding an optimal balance and finding ways of using complex electronic and phononic structures to avoid the counter-indications mentioned above. In this talk, I discuss some of the issues involved in the context of recent results. One key aspect is optimization of the doping level in a given thermoelectric material. While this has long been understood in terms of standard semiconductor parabolic band models, we find surprisingly different results for many thermoelectric materials when the actual first principles band structures are used. This has led to prediction of a number of useful thermoelectrics, some that are new, and surprisingly some that are old. This work was done in collaboration with David Parker, Xin Chen, Olivier Delaire and Mao-Hua Du and was supported by the Department of Energy through the S3TEC Energy Frontier Research Center.

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                  • Dean's Channel: Professor Gang Cao and the Center for Advanced Materials

                    11:55

                    from UK College of Arts & Sciences / Added

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                    Dean Mark Kornbluh continues his Dean's Channel series, sitting down with professor Gang Cao from the Department of Physics & Astronomy and Director of UK's Center for Advanced Materials. They discuss the great benefit of UK housing its own helium liquefier as well as a number of other advances with materials research.

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