Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
-
- Alignment (1)
- Bias (1)
- Cepheids (1)
- Control (1)
- Dissociation (1)
-
- Electric (1)
- Electron diffraction (1)
- Exchange (1)
- Ferroelectric liquid crystals (1)
- Ferroelectric polymers (1)
- Ferroelectricity (1)
- Infrared spectroscopy (1)
- Isothermal (1)
- Lidar (1)
- Molecular structure (1)
- Mott (1)
- Pierre Auger Observatory (1)
- Polarimeter (1)
- Polarization (1)
- Robust (1)
- Room (1)
- Source (1)
- Stars—individual—V371 Per (1)
- Temperature (1)
- Trifluoroethylene (1)
- Vinylidene fluoride (1)
- Publication
-
- Ralph Skomski Publications (8)
- Axel Enders Publications (7)
- Kenneth Bloom Publications (7)
- Anthony F. Starace Publications (5)
- Evgeny Tsymbal Publications (5)
-
- Stephen Ducharme Publications (5)
- Xiaoshan Xu Papers (5)
- Christian Binek Publications (3)
- Department of Physics and Astronomy: Faculty Publications (3)
- Gregory Snow Publications (3)
- Peter Dowben Publications (3)
- Timothy J. Gay Publications (3)
- David Sellmyer Publications (2)
- Department of Physics and Astronomy: Dissertations, Theses, and Student Research (2)
- Edward Schmidt Publications (2)
- Robert G. Fuller Publications (2)
- Xia Hong Publications (2)
- Alexei Gruverman Publications (1)
- Donald Umstadter Publications (1)
- Gordon Gallup Publications (1)
- Martin Centurion Publications (1)
- Materials Research Science and Engineering Center: Faculty Publications (1)
- Nebraska Center for Materials and Nanoscience: Faculty Publications (1)
- Paul Burrow Publications (1)
- Shireen Adenwalla Papers (1)
Articles 1 - 30 of 75
Full-Text Articles in Physics
Detecting Electron Motion In Atoms And Molecules, Hua-Chieh Shao, Anthony F. Starace
Detecting Electron Motion In Atoms And Molecules, Hua-Chieh Shao, Anthony F. Starace
Anthony F. Starace Publications
The detection of spatial and temporal electronic motion by scattering of subfemtosecond pulses of 10 keV electrons from coherent superpositions of electronic states of both H and T+2 is investigated. For the H atom, we predict changes in the diffraction images that reflect the time-dependent effective radius of the electronic charge density. For an aligned T+2 molecule, the diffraction image changes reflect the time-dependent localization or delocalization of the electronic charge density.
Unl Physicists Model Potential 4-D Imaging Technique, Tom Simons, Hua-Chieh Shao, Anthony F. Starace
Unl Physicists Model Potential 4-D Imaging Technique, Tom Simons, Hua-Chieh Shao, Anthony F. Starace
Anthony F. Starace Publications
A long-standing goal of science is to be able to understand how matter behaves at the atomic and subatomic level. How electrons rearrange when atoms or molecules come together is the essence of chemistry, and the ability to manipulate those rearrangements is the goal of the emerging sphere of nanotechnology. A fuller understanding could lead to enormous scientific and technological breakthroughs. Unfortunately, significant problems confront scientists and engineers in attacking the question. Not only are atoms and molecules very small, requiring highly specialized equipment to "see" them, everything at the atomic level happens very, very fast. For example, an electron …
Movies Of Electrons In Atoms, Michael Schirber, Hua-Chieh Shao, Anthony F. Starace
Movies Of Electrons In Atoms, Michael Schirber, Hua-Chieh Shao, Anthony F. Starace
Anthony F. Starace Publications
Physicists have long been able to snap atomic-scale pictures by shining a beam of electrons at a target, but filming the electronic structure of an atom as it changes in time is the next goal. A rapid "strobing" of electron pulses less than a millionth of a billionth of a second long should do the trick, according to a theoretical analysis in the 24 December Physical Review Letters. The authors demonstrate with computer simulations that ultrafast electron pulses could track the "breathing" state of an excited atom or the hopping of electrons between atoms in a molecule. Such movies open …
Potential Barrier Effects In Two-Photon Ionization Processes, Liang-Wen Pi, Anthony F. Starace
Potential Barrier Effects In Two-Photon Ionization Processes, Liang-Wen Pi, Anthony F. Starace
Anthony F. Starace Publications
Potential barriers in the effective radial potential experienced by a photoexcited electron are shown to result in dramatic, resonancelike effects in two-photon ionization processes. In a two-photon ionization process, such potential barriers may affect not only the final state of the electron (as in ordinary photoionization), but also the intermediate-state electron wave packet corresponding to the absorption of one photon. We illustrate these effects for the generalized two-photon cross sections for ionization of Ar and Xe within a single-active-electron, central-potential model.
Magnetoelectric Effects In Ferromagnetic Cobalt/Ferroelectric Copolymer Multilayer Films, Abhijit Mardana, Mengjun Bai, A. Baruth, Stephen Ducharme, Shireen Adenwalla
Magnetoelectric Effects In Ferromagnetic Cobalt/Ferroelectric Copolymer Multilayer Films, Abhijit Mardana, Mengjun Bai, A. Baruth, Stephen Ducharme, Shireen Adenwalla
Stephen Ducharme Publications
Interactions between a ferromagnet, cobalt, and a ferroelectric copolymer, poly(vinylidene fluoride with trifluoroethylene) in thin film heterostructures result in a 5% change in the ferroelectric polarization on application of a perpendicular 6 kG magnetic field corresponding to a magnetoelectric coupling coefficient of α =5.45 V/cm Oe. The effect disappears on magnetic saturation, ruling out conventional strain coupling. A simple model posits that the ferroelectric film develops in-plane strain gradients, a consequence of the coupling to strain gradients present at the domain walls in the multidomain Co layer, resulting in the measured polarization change via the flexoelectric effect.
Potential Barrier Effects In High-Order Harmonic Generation By Transition-Metal Ions, M. V. Frolov, N. L. Manakov, Anthony F. Starace
Potential Barrier Effects In High-Order Harmonic Generation By Transition-Metal Ions, M. V. Frolov, N. L. Manakov, Anthony F. Starace
Anthony F. Starace Publications
The experimental finding of significant enhancement or suppression of particular harmonics generated by the ionic component of laser-produced plasmas of transition-metal atoms is explained theoretically in terms of the standard three-step scenario for strong-field harmonic generation, taking into account the potential barrier effects that lead to a strong 3p → 3d electric dipole transition that dominates the photoionization cross sections of the outer subshells of those ions.
Investigation Of State Retention In Metal–Ferroelectric–Insulator–Semiconductor Structures Based On Langmuir–Blodgett Copolymer Films, Timothy J. Reece, A. Gerber, Institut Für Festkörperforschung, Forschungszentrum Jülich, Germany, Stephen Ducharme
Investigation Of State Retention In Metal–Ferroelectric–Insulator–Semiconductor Structures Based On Langmuir–Blodgett Copolymer Films, Timothy J. Reece, A. Gerber, Institut Für Festkörperforschung, Forschungszentrum Jülich, Germany, Stephen Ducharme
Stephen Ducharme Publications
Among the ferroelectric thin films considered for use in nonvolatile memory devices, the ferroelectric copolymer of polyvinylidene fluoride, PVDF (C2H2F2), with trifluoroethylene, TrFE (C2HF3), has distinct advantages, including low dielectric constant, low processing temperature, relative low cost compared with epitaxial ferroelectric oxides, and compatibility with organic semiconductors. We report the operation and polarization retention properties of a metal– ferroelectric–insulator–semiconductor bistable capacitor memory element consisting of an aluminum gate, a P(VDF-TrFE) Langmuir–Blodgett film, a 30 nm cerium oxide buffer layer, and a moderately doped silicon wafer. The device exhibited a 1.9 …
Robust Isothermal Electric Control Of Exchange Bias At Room Temperature, Xi He, Yi Wang, Christian Binek, Peter A. Dowben
Robust Isothermal Electric Control Of Exchange Bias At Room Temperature, Xi He, Yi Wang, Christian Binek, Peter A. Dowben
Christian Binek Publications
Voltage-controlled spin electronics is crucial for continued progress in information technology. It aims at reduced power consumption, increased integration density and enhanced functionality where non-volatile memory is combined with highspeed logical processing. Promising spintronic device concepts use the electric control of interface and surface magnetization. From the combination of magnetometry, spin-polarized photoemission spectroscopy, symmetry arguments and first-principles calculations, we show that the (0001) surface of magnetoelectric Cr2O3 has a roughness-insensitive, electrically switchable magnetization. Using a ferromagnetic Pd/Co multilayer deposited on the (0001) surface of a Cr2O3 single crystal, we achieve reversible, room-temperature isothermal switching of the exchange-bias field between positive …
Boron Carbide Based Solid State Neutron Detectors: The Effects Of Bias And Time Constant On Detection Efficiency, Nina Hong, John Mullins, Keith Foreman, Shireen Adenwalla
Boron Carbide Based Solid State Neutron Detectors: The Effects Of Bias And Time Constant On Detection Efficiency, Nina Hong, John Mullins, Keith Foreman, Shireen Adenwalla
Shireen Adenwalla Papers
Neutron detection in thick boron carbide(BC)/n-type Si heterojunction diodes shows a threefold increase in efficiency with applied bias and longer time constants. The improved efficiencies resulting from long time constants have been conclusively linked to the much longer charge collection times in the BC layer. Neutron detection signals from both the p-type BC layer and the n-type Si side of the heterojunction diode are observed, with comparable efficiencies. Collectively, these provide strong evidence that the semiconducting BC layer plays an active role in neutron detection, both in neutron capture and in charge generation and collection.
Ferroelectric Field Effect Transistors Using Very Thin Ferroelectric Polyvinylidene Fluoride Copolymer Films As Gate Dielectrics, A. Gerber, Center Of Nanoelectronic Systems For Information Technology (Cni), Research Center Jülich, Germany, R. Waser, Timothy J. Reece, E. Rije, Stephen Ducharme, Hermann Kohlstedt
Ferroelectric Field Effect Transistors Using Very Thin Ferroelectric Polyvinylidene Fluoride Copolymer Films As Gate Dielectrics, A. Gerber, Center Of Nanoelectronic Systems For Information Technology (Cni), Research Center Jülich, Germany, R. Waser, Timothy J. Reece, E. Rije, Stephen Ducharme, Hermann Kohlstedt
Stephen Ducharme Publications
We report electrical characterization of memory elements consisting of a p-type silicon field-effect transistor incorporating a ferroelectric polymer Langmuir–Blodgett film into the gate insulator to produce bistability through polarization hysteresis. The thin gate insulator, consisting of a 10 nm thick silicon oxide layer and a 35 nm thick ferroelectric polymer film, enabled bistable operation at 4 V. Device hysteresis as a function of gate voltage was evident both in the device capacitance, which was measured between the gate and drain, and in the source-drain conductance. The ferroelectric film polarization was not saturated, even up to operating voltages of 10 V. …
Substrate Dependent Buffer-Layer Assisted Growth Of Nanoclusters, Jan Honolka, Violetta Sessi, Jian Zhang, Simon Hertenberger, Axel Enders, Klaus Kern
Substrate Dependent Buffer-Layer Assisted Growth Of Nanoclusters, Jan Honolka, Violetta Sessi, Jian Zhang, Simon Hertenberger, Axel Enders, Klaus Kern
Axel Enders Publications
The role of the substrate on the morphology of nanometer size clusters fabricated by buffer layer assisted growth (BLAG) was studied using scanning tunneling microscopy. Clusters of Fe and Co were deposited on Ag(111), Cu(100), Rh(111), and Pt(111) surfaces using identical BLAG parameters, which are temperature, as well as metal and buffer layer coverage. Semi-hemispherical clusters are found on Ag(111) and Cu(100), while flat monolayer high islands are observed on Rh(111) and Pt(111) due to complete wetting. The results of this study are in agreement with the common notion that BLAG is useful to deposit clusters of virtually any material …
Upgrade To The Pierre Auger Cosmic Ray Observatory's Lidar System, Emily B. Petermann
Upgrade To The Pierre Auger Cosmic Ray Observatory's Lidar System, Emily B. Petermann
Department of Physics and Astronomy: Dissertations, Theses, and Student Research
The Pierre Auger Cosmic Ray Observatory currently operates four elastic lidar systems in order to characterize the atmospheric aerosol content above the observatory. The atmospheric information gained by the lidar system is then used in the calibration of the observatory’s four fluorescence detectors. Currently the four lidars in operation are unable to accurately determine the aerosol content below a distance of 1 km. A project is currently underway to upgrade the current lidar system by adding an additional detector to each of the existing lidar systems. The considered designs for this upgrade and the initial results from the upgrade prototype …
Robert Fuller Obituary (Local)
Robert Fuller Obituary (Local)
Robert G. Fuller Publications
Robert G. Fuller, 76, Lincoln, died on Monday evening, April 9, 2012, as a result of complications from a severe brain aneurysm experienced on Thanksgiving morning. His enthusiasm for life and new ideas and his love of chocolate, raspberries, and conversation will be deeply missed.
More Variations On Aharonov-Bohm, Peter A. Sturock, Timothy R. Groves, Alexander Ershkovich, C. Alden Mead, Herman Batelaan And Akira Tonomura: Batelaan And Tonomura Reply, Herman Batelaan, Akira Tonomura
More Variations On Aharonov-Bohm, Peter A. Sturock, Timothy R. Groves, Alexander Ershkovich, C. Alden Mead, Herman Batelaan And Akira Tonomura: Batelaan And Tonomura Reply, Herman Batelaan, Akira Tonomura
Department of Physics and Astronomy: Faculty Publications
First paragraph: Werner Ehrenberg and Raymond Siday did propose the magnetic version of what is now called the Aharonov-Bohm (AB) effect, as Peter Sturrock and Timothy Groves point out. We had included this reference in the early versions of our manuscript. However, limited space directed the focus of the paper to the "effect without a force" discussion, rather than a historic perspective.
The Double-Mode Cepheid V371 Persei Redux, Edward G. Schmidt
The Double-Mode Cepheid V371 Persei Redux, Edward G. Schmidt
Edward Schmidt Publications
A metallicity of [Fe/H] = –0.05 to –0.40 was derived from four spectra of the peculiar beat Cepheid V371 Per. This conflicts with previous estimates ranging from –0.7 to –1.0 based on the period ratio. It is suggested that the discrepancy may be resolved by assuming near solar metallicity but a low mass. This is in accord with a suggestion by Sandage and Tammann that the AHB3 (or BL Her) stars are Population I analogs of short-period type II Cepheids. Further pulsational modeling is needed to clarify the status of this star and to understand the AHB3 stars.
Search For The Standard Model Higgs Boson In P-Pbar Interactions With The Decay Mode H -> W+ W- -> Mu+ Nu Mu- Nu At The D0 Experiment, Dale M. Johnston
Search For The Standard Model Higgs Boson In P-Pbar Interactions With The Decay Mode H -> W+ W- -> Mu+ Nu Mu- Nu At The D0 Experiment, Dale M. Johnston
Department of Physics and Astronomy: Dissertations, Theses, and Student Research
A search for the standard model Higgs boson in p-pbar collisions resulting in two muons and large missing transverse energy is presented. The analysis uses 4.2 fb-1 of integrated luminosity at a center-of-mass energy of sqrt(s) = 1.96 TeV collected between April 2002 and December 2008 with the D0 detector at the Fermilab Tevatron collider. No significant excess above the background estimation is observed and limits are derived on Higgs boson production.
Early Stages Of Direct L10 Fept Nanocluster Formation: The Effects Of Plasma Characteristics, M. M. Patterson, A. Cochran, J. Ferina, X. Rui, T. A. Zimmerman, Zhiguang Sun, Matthew J. Kramer, David J. Sellmyer, Jeffrey E. Shield
Early Stages Of Direct L10 Fept Nanocluster Formation: The Effects Of Plasma Characteristics, M. M. Patterson, A. Cochran, J. Ferina, X. Rui, T. A. Zimmerman, Zhiguang Sun, Matthew J. Kramer, David J. Sellmyer, Jeffrey E. Shield
David Sellmyer Publications
The formation of FePt nanoclusters via gas condensation has attracted a great deal of attention. The clusters normally form with the magnetically soft A1 structure rather than the desired L10 structure with high magnetocrystalline anisotropy. This work has examined the effects of plasma characteristics on the early stages of order in the formation L10 FePt nanoclusters via inert gas condensation. The plasma characteristics have been modified to control ion density in the nanocluster condensation region. Increased ion density results in more cluster-ion collisions. The energy imparted to the clusters as a result of these collisions allows atomic rearrangements …
Unusual Resistance Hysteresis In N-Layer Graphene Field Effect Transistors Fabricated On Ferroelectric Pb(Zr0.2ti0.8)O3, X. Hong, J. Hoffman, A. Posadas, K. Zou, C. H. Ahn, J. Zhu
Unusual Resistance Hysteresis In N-Layer Graphene Field Effect Transistors Fabricated On Ferroelectric Pb(Zr0.2ti0.8)O3, X. Hong, J. Hoffman, A. Posadas, K. Zou, C. H. Ahn, J. Zhu
Xia Hong Publications
We have fabricated n-layer graphene field effect transistors on epitaxial ferroelectric Pb(Zr0.2Ti0.8)O3 (PZT) thin films. At low gate voltages, PZT behaves as a high-k dielectric with k up to 100. An unusual resistance hysteresis occurs in gate sweeps at high voltages, with its direction opposite to that expected from the polarization switching of PZT. The relaxation of the metastable state is thermally activated, with an activation barrier of 50–110 meV and a time constant of 6 h at 300 K. We attribute its origin to the slow dissociation/recombination dynamics of water molecules adsorbed at …
Deposition Of High-Quality Hfo2 On Graphene And The Effect Of Remote Oxide Phonon Scattering, K. Zou, X. Hong, D. Keefer, J. Zhu
Deposition Of High-Quality Hfo2 On Graphene And The Effect Of Remote Oxide Phonon Scattering, K. Zou, X. Hong, D. Keefer, J. Zhu
Xia Hong Publications
We demonstrate atomic layer deposition of high-quality dielectric HfO2 films on graphene and determine the magnitude of remote oxide surface phonon scattering in dual-oxide structures. The carrier mobility in these HfO2-covered graphene samples reaches 20 000 cm2/Vs at low temperature. Distinct contributions to the resistivity from surface optical phonons in the SiO2 substrate and the HfO2 overlayer are isolated. At 300 K, surface phonon modes of the HfO2 film centered at 54 meV limit the mobility to approximately 20 000 cm2/Vs.
Magnetodielectric Coupling Of Infrared Phonons In Single-Crystal Cu2oseo3, K. H. Miller, X. S. Xu, H. Berger, E. S. Knowles, D. J. Arenas, M. W. Meisel, D. B. Tanner
Magnetodielectric Coupling Of Infrared Phonons In Single-Crystal Cu2oseo3, K. H. Miller, X. S. Xu, H. Berger, E. S. Knowles, D. J. Arenas, M. W. Meisel, D. B. Tanner
Xiaoshan Xu Papers
Reflection and transmission as a function of temperature (5–300 K) have been measured on a single crystal of the magnetoelectric ferrimagnetic compound Cu2OSeO3 utilizing light spanning the far infrared to the visible portions of the electromagnetic spectrum. The complex dielectric function and optical properties were obtained via Kramers-Kronig analysis and by fits to a Drude-Lortentz model. The fits of the infrared phonons show a magnetodielectric effect near the transition temperature (Tc~60 K). Assignments to strong far-infrared phonon modes have been made, especially those exhibiting anomalous behavior around the transition temperature.
Dynamical Theory Calculations Of Spin-Echo Resolved Grazing-Incidence Scattering From A Diffraction Grating, Rana Ashkar, P. Stonaha, A. L. Washington, V. R. Shah, M. R. Fitzsimmons, B. Maranville, C. F. Majkrzak, W. T. Lee, W. L. Schaich, Roger Pynn
Dynamical Theory Calculations Of Spin-Echo Resolved Grazing-Incidence Scattering From A Diffraction Grating, Rana Ashkar, P. Stonaha, A. L. Washington, V. R. Shah, M. R. Fitzsimmons, B. Maranville, C. F. Majkrzak, W. T. Lee, W. L. Schaich, Roger Pynn
Nebraska Center for Materials and Nanoscience: Faculty Publications
Neutrons scattered or reflected from a diffraction grating are subject to a periodic potential analogous to the potential experienced by electrons within a crystal. Hence, the wavefunction of the neutrons can be expanded in terms of Bloch waves and a dynamical theory can be applied to interpret the scattering phenomenon. In this paper, a dynamical theory is used to calculate the results of neutron spin-echo resolved grazing-incidence scattering (SERGIS) from a silicon diffraction grating with a rectangular profile. The calculations are compared with SERGIS measurements made on the same grating at two neutron sources: a pulsed source and a continuous …
Search For A Resonance Decaying Into Wz Boson Pairs In Pp Collisions, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration
Search For A Resonance Decaying Into Wz Boson Pairs In Pp Collisions, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration
Kenneth Bloom Publications
We present the first search for an electrically charged resonance W’ decaying to a WZ boson pair using 4.1 fb-1 of integrated luminosity collected with the D0 detector at the Fermilab Tevatron pp collider. The WZ pairs are reconstructed through their decays into three charged leptons (ℓ = e, μ). A total of 9 data events is observed in good agreement with the background prediction. We set 95% C.L. limits on the W’WZ coupling and on the W’ production cross section multiplied by the branching fractions. We also exclude W’ masses between 188 and 520 …
Search For The Associated Production Of A B Quark And A Neutral Supersymmetric Higgs Boson That Decays Into Τ Pairs, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration
Search For The Associated Production Of A B Quark And A Neutral Supersymmetric Higgs Boson That Decays Into Τ Pairs, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration
Kenneth Bloom Publications
We report results from a search for production of a neutral Higgs boson in association with a b quark. We search for Higgs decays to τ pairs with one τ subsequently decaying to a muon and the other to hadrons. The data correspond to 2.7 fb-1 of pp collisions recorded by the D0 detector at √s = 1.96 TeV. The data are found to be consistent with background predictions. The result allows us to exclude a significant region of parameter space of the minimal supersymmetric model.
Magnetic Properties Of Nickel Hydroxide Nanoparticles, X. H. Liu, W. Liu, X. K. Lv, F. Yang, X. Wei, Z. D. Zhang, David J. Sellmyer
Magnetic Properties Of Nickel Hydroxide Nanoparticles, X. H. Liu, W. Liu, X. K. Lv, F. Yang, X. Wei, Z. D. Zhang, David J. Sellmyer
David Sellmyer Publications
The magnetic properties of 10 nm size Ni(OH)2 nanoparticles prepared by sol-gel method have been studied. The magnetic moments increase with decreasing temperature in a low applied field, which is due to the spin-frozen-like state at low temperatures, and the metamagnetic transition is not clearly observed even in an applied field of 70 kOe due to the size effect. Furthermore, the transition from paramagnetic to antiferromagnetic in the Ni(OH)2 nanoparticles occurs at lower temperature (22 K).
Measurement Of The Depth Of Maximum Of Extensive Air Showers Above 1018 Ev, J. Abraham, Gregory Snow, Pierre Auger Collaboration
Measurement Of The Depth Of Maximum Of Extensive Air Showers Above 1018 Ev, J. Abraham, Gregory Snow, Pierre Auger Collaboration
Gregory Snow Publications
We describe the measurement of the depth of maximum, Xmax, of the longitudinal development of air showers induced by cosmic rays. Almost 4000 events above 1018 eV observed by the fluorescence detector of the Pierre Auger Observatory in coincidence with at least one surface detector station are selected for the analysis. The average shower maximum was found to evolve with energy at a rate of (106+35-21) g/cm2/decade below 1018.24 ±0.05 eV, and (24 ± 3) g/cm2/decade above this energy. The measured shower-to-shower fluctuations decrease from about 55 to 26 …
Transverse-Momentum And Pseudorapidity Distributions Of Charged Hadrons In Pp Collisions At √S=7 Tev, V. Khachatryan, Kenneth A. Bloom, S. Bose, J. Butt, Daniel R. Claes, Aaron Dominguez, Michael Eads, J. Keller, T. Kelly, Ilya Kravchenko, J. Lazo-Flores, Carl Lundstedt, H. Malbouisson, Sudhir Malik, Gregory Snow, Cms Collaboration
Transverse-Momentum And Pseudorapidity Distributions Of Charged Hadrons In Pp Collisions At √S=7 Tev, V. Khachatryan, Kenneth A. Bloom, S. Bose, J. Butt, Daniel R. Claes, Aaron Dominguez, Michael Eads, J. Keller, T. Kelly, Ilya Kravchenko, J. Lazo-Flores, Carl Lundstedt, H. Malbouisson, Sudhir Malik, Gregory Snow, Cms Collaboration
Gregory Snow Publications
Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at √s=7 TeV are measured with the inner tracking system of the CMS detector at the LHC. The charged-hadron yield is obtained by counting the number of reconstructed hits, hit pairs, and fully reconstructed charged-particle tracks. The combination of the three methods gives a charged-particle multiplicity per unit of pseudorapidity dNch=dη ⃒|η|<0.5= 5.78 ± 0.01(stat) ± 0.23(syst) for non-single-diffractive events, higher than predicted by commonly used models. The relative increase in charged-particle multiplicity from √s=0.9 to 7 TeV is [±66.1 ± 1.0(stat) ± 4.2(syst)]%. The mean transverse …
Combination Of Tevatron Searches For The Standard Model Higgs Boson In The W+W- Decay Mode, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration
Combination Of Tevatron Searches For The Standard Model Higgs Boson In The W+W- Decay Mode, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration
Kenneth Bloom Publications
We combine searches by the CDF and D0 Collaborations for a Higgs boson decaying to W+W-. The data correspond to an integrated total luminosity of 4.8 (CDF) and 5.4 (D0) fb-1 of pp collisions at √s = 1.96 TeV at the Fermilab Tevatron collider. No excess is observed above background expectation, and resulting limits on Higgs boson production exclude a standard model Higgs boson in the mass range 162–166 GeV at the 95% C.L.
Search For The Standard Model Higgs Boson In The Zh → ΝνBb Channel In 5.2 Fb-1 Of Pp Collisions At √S = 1.96 Tev, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration
Search For The Standard Model Higgs Boson In The Zh → ΝνBb Channel In 5.2 Fb-1 Of Pp Collisions At √S = 1.96 Tev, V. M. Abazov, Kenneth A. Bloom, Gregory Snow, D0 Collaboration
Kenneth Bloom Publications
A search is performed for the standard model Higgs boson in 5.2 fb-1 of pp collisions at √s = 1.96 TeV, collected with the D0 detector at the Fermilab Tevatron Collider. The final state considered is a pair of b jets and large missing transverse energy, as expected from pp → ZH → ννbb production. The search is also sensitive to the WH → ℓνbb channel when the charged lepton is not identified. For a Higgs boson mass of 115 GeV, a limit is set at the 95% C.L. on the cross section multiplied by branching …
Why Ferroelectric Polyvinylidene Fluoride Is Special, Matt Poulsen, Stephen Ducharme
Why Ferroelectric Polyvinylidene Fluoride Is Special, Matt Poulsen, Stephen Ducharme
Stephen Ducharme Publications
Ferroelectric polymers entail a number of constraints, which together limit the useful compositional variations. These constraints include the following: a stable molecular dipole moment, compact crystal structure, conformational flexibility, and minimal steric hindrance. They are well satisfied by the prototype ferroelectric polymer, polyvinylidene fluoride, and yet almost every other conceivable molecular structure is limited by comparison.
Piezoelectric Tuning Of Exchange Bias In A Batio3/Co/Coo Heterostructure, Srinivas Polisetty, W. Echtenkamp, Keith Jones, X. He, Sarbeswar Sahoo, Christian Binek
Piezoelectric Tuning Of Exchange Bias In A Batio3/Co/Coo Heterostructure, Srinivas Polisetty, W. Echtenkamp, Keith Jones, X. He, Sarbeswar Sahoo, Christian Binek
Christian Binek Publications
Piezoelectrically controlled strain is used for electric tuning of exchange-bias fields. A generic exchange-bias Co/CoO bilayer is deposited on the surface of a ferroelectric and thus piezoelectric BaTiO3 substrate which allows to apply electrically and thermally tunable stress in the adjacent ferromagnetic Co thin film. The stress-induced strain alters foremost the magnetic anisotropy of the Co film and by that the magnetization orientation at the Co/CoO interface modifying the exchange-bias field. This results in a pronounced electrically induced weakening of the exchange bias but also includes the possibility of tuning the exchange-bias field through a subtle sign change from …