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University of Nebraska - Lincoln

2012

Faculty Publications, Department of Physics and Astronomy

Articles 1 - 8 of 8

Full-Text Articles in Physics

Updated Results From The Rice Experiment And Future Prospects For Ultra-High Energy Neutrino Detection At The South Pole, Ilya Kravchenko, S. Hussain, D. Seckel, Dave Z. Besson, E. Fensholt, John P. Ralston, J. Taylor, Kenneth L. Ratzlaff, R. Young Jan 2012

Updated Results From The Rice Experiment And Future Prospects For Ultra-High Energy Neutrino Detection At The South Pole, Ilya Kravchenko, S. Hussain, D. Seckel, Dave Z. Besson, E. Fensholt, John P. Ralston, J. Taylor, Kenneth L. Ratzlaff, R. Young

Faculty Publications, Department of Physics and Astronomy

The RICE experiment seeks observation of ultra-high energy (UHE; Ev > 1017 eV) neutrinos interacting in Antarctic ice, by measurement of the radio frequency (RF) Cherenkov radiation resulting from the collision of a neutrino with an ice molecule. RICE was initiated in 1999 as a first-generation prototype for an eventual, large-scale in-ice UHE neutrino detector. Herein, we present updated limits on the diffuse UHE neutrino flux, based on 12 years of data taken between 1999 and 2010. We find no convincing neutrino candidates, resulting in 95% confidence-level model-dependent limits on the flux E2v dϕ/ dEv < 0.5 X 10-6 ...


Measurement Of The Ultrafast Temporal Response Of A Plasmonic Antenna, Maria Becker, Wayne Cheng-Wei Huang, Herman Batelaan, Elizabeth J. Smythe, Federico Capasso Jan 2012

Measurement Of The Ultrafast Temporal Response Of A Plasmonic Antenna, Maria Becker, Wayne Cheng-Wei Huang, Herman Batelaan, Elizabeth J. Smythe, Federico Capasso

Faculty Publications, Department of Physics and Astronomy

We report a measurement on the temporal response of a plasmonic antenna at the femtosecond time scale. The antenna consists of a square array of nanometer-size gold rods. We find that the far-field dispersion of light reflected from the plasmonic antenna is less than that of a 1.2 mm thick glass slide. Assuming a simple oscillating dipole model this implies that the near-field of the antenna may be used as an electron switch that responds faster than 20 f s. Alternatively, ultrafast electron diffraction may be used to investigate the near-field dynamics of the plasmonic antenna.


Quantized Excitation Spectrum Of The Classical Harmonic Oscillator In Zero-Point Radiation, Wayne Cheng-Wei Huang, Herman Batelaan Jan 2012

Quantized Excitation Spectrum Of The Classical Harmonic Oscillator In Zero-Point Radiation, Wayne Cheng-Wei Huang, Herman Batelaan

Faculty Publications, Department of Physics and Astronomy

We report that upon excitation by a single pulse, the classical harmonic oscillator immersed in classical electromagnetic zero-point radiation, as described by random electrodynamics, exhibits a quantized excitation spectrum in agreement to that of the quantum harmonic oscillator. This numerical result is interesting in view of the generally accepted idea that classical theories do not support quantized energy spectra.


Perpendicular Magnetization In Coo (111) Layers Induced By Exchange Interaction With Ferromagnetic Co And Ni60cu40 Nanoclusters, Damien Le Roy, R. Morel, A. Brenac, S. Pouget, L. Notin Jan 2012

Perpendicular Magnetization In Coo (111) Layers Induced By Exchange Interaction With Ferromagnetic Co And Ni60cu40 Nanoclusters, Damien Le Roy, R. Morel, A. Brenac, S. Pouget, L. Notin

Faculty Publications, Department of Physics and Astronomy

The magnetization reversal of ferromagnetic nanoparticles coupled by exchange with a CoO (111) thin film has been studied. The interfacial exchange interaction triggers the appearance of an out-of-plane magnetization in the CoO (111) film. Co and Ni60Cu40 particles were chosen, as they present an order of magnitude difference in the saturation magnetization and Curie temperatures that surround the Ne´el temperature of CoO. In both cases, the exchange coupling leads to an increase of the coercive field, up to 200% in Co particles, and small exchange bias of 100 Oe when the external magnetic field is applied ...


Tailoring Magnetocrystalline Anisotropy Of Fept By External Strain, Pavel Lukashev, Nathan Horrell, Renat F. Sabirianov Jan 2012

Tailoring Magnetocrystalline Anisotropy Of Fept By External Strain, Pavel Lukashev, Nathan Horrell, Renat F. Sabirianov

Faculty Publications, Department of Physics and Astronomy

We propose using strain assisted reduction in anisotropy of FePt to control magnetization reversal in the writing on the magnetic storage devices. Our first-principles calculations show 21% decrease of the magnetocrystalline anisotropy energy (MAE) with application of 1.5% tensile biaxial strain. The reduction of MAE is primarily due to the change of the c/a ratio and to some extent due to the increase in volume. We propose building bilayer (or heterostructure) of FePt and piezoelectric film. This system is expected to allow the control of anisotropy constant by applying electric field to the system. Finally, we discuss the ...


Controlled Double-Slit Electron Diffraction, Roger Bach, Damian Pope, Sy-Hwang Liou, Herman Batelaan Jan 2012

Controlled Double-Slit Electron Diffraction, Roger Bach, Damian Pope, Sy-Hwang Liou, Herman Batelaan

Faculty Publications, Department of Physics and Astronomy

Double-slit diffraction is a corner stone of quantum mechanics. It illustrates key features of quantum mechanics: interference and the particle-wave duality of matter. In 1965, Richard Feynman presented a thought experiment to show these features. Here we demonstrate the full realization of his famous thought experiment. By placing a movable mask in front of a double-slit to control the transmission through the individual slits, probability distributions for single- and double-slit arrangements were observed. Also, by recording single electron detection events diffracting through a double-slit, a diffraction pattern was built up from individual events.


On The Relation Between The Feynman Paradox And The Aharonov–Bohm Effects, Scot Mcgregor, Ryan Hotovy, Adam Caprez, Herman Batelaan Jan 2012

On The Relation Between The Feynman Paradox And The Aharonov–Bohm Effects, Scot Mcgregor, Ryan Hotovy, Adam Caprez, Herman Batelaan

Faculty Publications, Department of Physics and Astronomy

The magnetic Aharonov–Bohm (A–B) effect occurs when a point charge interacts with a line of magnetic flux, while its reciprocal, the Aharonov–Casher (A–C) effect, occurs when a magnetic moment interacts with a line of charge. For the two interacting parts of these physical systems, the equations of motion are discussed in this paper. The generally accepted claim is that both parts of these systems do not accelerate, while Boyer has claimed that both parts of these systems do accelerate. Using the Euler–Lagrange equations we predict that in the case of unconstrained motion, only one part ...


Dynamics Underlying The Gaussian Distribution Of The Classical Harmonic Oscillator In Zero-Point Radiation, Wayne Cheng-Wei Huang, Herman Batelaan Jan 2012

Dynamics Underlying The Gaussian Distribution Of The Classical Harmonic Oscillator In Zero-Point Radiation, Wayne Cheng-Wei Huang, Herman Batelaan

Faculty Publications, Department of Physics and Astronomy

No abstract provided.