Open Access. Powered by Scholars. Published by Universities.®
- Institution
-
- University of Nebraska - Lincoln (73)
- Old Dominion University (16)
- Bucknell University (7)
- Portland State University (5)
- University of Kentucky (5)
-
- Florida International University (3)
- Technological University Dublin (3)
- Air Force Institute of Technology (2)
- Syracuse University (2)
- University of Wollongong (2)
- Boise State University (1)
- Chapman University (1)
- City University of New York (CUNY) (1)
- College of Saint Benedict and Saint John's University (1)
- Lawrence University (1)
- Linfield University (1)
- Purdue University (1)
- San Jose State University (1)
- St. Cloud State University (1)
- The British University in Egypt (1)
- University of South Carolina (1)
- Keyword
-
- Phonon modes (12)
- Gallium oxide (11)
- Monoclinic (9)
- Polymer (9)
- Ferroelectric (7)
-
- Electron diffraction (6)
- Film (6)
- Langmuir-Blodgett (6)
- Thin (6)
- Avalanches (5)
- Surface structure (5)
- Nanotechnology (4)
- Single crystals (4)
- Surface phase transformations (4)
- Ellipsometry (3)
- Iridates (3)
- Laser pulses (3)
- Magnetism (3)
- Metallic glass (3)
- Nanostructured materials (3)
- Solar cells (3)
- Surface diffusion (3)
- Transmission electron microscopes (3)
- Anisotropy (2)
- Atomic force microscopy (2)
- Condensed matter (2)
- Density functional theory (2)
- Effective mass (2)
- Electron irradiation (2)
- Elemental semiconductors (2)
- Publication Year
- Publication
-
- Department of Electrical and Computer Engineering: Faculty Publications (20)
- Stephen Ducharme Publications (17)
- Electrical & Computer Engineering Faculty Publications (15)
- Shireen Adenwalla Papers (12)
- Kirill Belashchenko Publications (10)
-
- Faculty Journal Articles (7)
- Center for Advanced Materials Faculty Publications (4)
- Faculty Publications (4)
- Physics Faculty Publications and Presentations (4)
- Articles (3)
- FIU Electronic Theses and Dissertations (3)
- Department of Electrical and Computer Engineering: Dissertations, Theses, and Student Research (2)
- Department of Physics and Astronomy: Dissertations, Theses, and Student Research (2)
- Department of Physics and Astronomy: Faculty Publications (2)
- Faculty of Engineering - Papers (Archive) (2)
- Materials Research Science and Engineering Center: Faculty Publications (2)
- Physics - All Scholarship (2)
- Physics Faculty Publications (2)
- Physics and Astronomy Faculty Publications (2)
- Alexei Gruverman Publications (1)
- Christian Binek Publications (1)
- Civil and Environmental Engineering Faculty Publications and Presentations (1)
- Computer Science Faculty Publications and Presentations (1)
- Department of Biological Systems Engineering: Papers and Publications (1)
- Department of Chemistry: Dissertations, Theses, and Student Research (1)
- Department of Electrical and Computer Engineering Faculty Publications (1)
- Faculty Publications, Chemistry (1)
- Lawrence University Honors Projects (1)
- Mathematics, Physics, and Computer Science Faculty Articles and Research (1)
- Nanotechnology Research Centre (1)
Articles 121 - 129 of 129
Full-Text Articles in Condensed Matter Physics
Temperature Dependence Of Step Density On Vicinal Pb(111), Z. H. Zhang, H. E. Elsayed-Ali
Temperature Dependence Of Step Density On Vicinal Pb(111), Z. H. Zhang, H. E. Elsayed-Ali
Electrical & Computer Engineering Faculty Publications
The temperature dependence of step density on the vicinal Pb(111) surface is investigated using reflection high-energy electron diffraction. When the temperature is increased from 323 to 590 K. the average terrace width and the average string length at the step edge decrease from 85±25 to 37±16 Å and from 220±33 to 25±8 Å, respectively. Thermal step collapse on the Pb(111) surface near its bulk melting temperature is not observed. Above 530±7 K, the change in the string length at the step edge with temperature becomes small, and the intensity of the (00) beam is significantly decreased. We conclude that partial …
Femtosecond Photoemission Study Of Ultrafast Electron Dynamics In Single-Crystal Au(111) Films, J. Cao, Y. Gao, H. E. Elsayed-Ali, R. J. D. Miller, D. A. Mantell
Femtosecond Photoemission Study Of Ultrafast Electron Dynamics In Single-Crystal Au(111) Films, J. Cao, Y. Gao, H. E. Elsayed-Ali, R. J. D. Miller, D. A. Mantell
Electrical & Computer Engineering Faculty Publications
The energy-dependent relaxation of photoexcited electrons has been measured by time-resolved two-photon photoemission spectroscopy on single-crystal Au(111) films with thickness ranging from 150 to 3000 Å. It is found that the energy-dependent relaxation does not show any significant thickness dependence, which indicates that electron transport is a much slower dynamical process in the near-surface region than expected from bulk properties. Furthermore, lifetimes of the photoexcited electrons can be fitted well by the Fermi-liquid theory with a scaling factor plus an effective upper lifetime. This observation enables separation of electron-electron scattering, and to a lesser extent electron-phonon scattering, processes from electron-transport …
Reflection High-Energy Electron-Diffraction Study Of Melting And Solidification Of Pb On Graphite, Z. H. Zhang, P. Kulatunga, H. E. Elsayed-Ali
Reflection High-Energy Electron-Diffraction Study Of Melting And Solidification Of Pb On Graphite, Z. H. Zhang, P. Kulatunga, H. E. Elsayed-Ali
Electrical & Computer Engineering Faculty Publications
The melting and solidification of Pb thin films on pyrolytic graphite are investigated in situ by reflection high-energy electron diffraction. Thin films with thicknesses of 4-150 monolayers are investigated. The surface morphology of the thin films were studied by scanning electron microscopy. Superheating of the Pb thin films by 4±2 to 12±2 K is observed from diffraction intensity measurements. Upon cooling the substrate, the Pb on graphite is seen to supercool by ∼69±4 K.
Femtosecond Photoemission Study Of Ultrafast Electron Dynamics On Cu(100), J. Cao, Y. Gao, R. J. D. Miller, Hani E. Elsayed-Ali, D. A. Mantell
Femtosecond Photoemission Study Of Ultrafast Electron Dynamics On Cu(100), J. Cao, Y. Gao, R. J. D. Miller, Hani E. Elsayed-Ali, D. A. Mantell
Electrical & Computer Engineering Faculty Publications
The energy dependence of the relaxation of photoexcited electrons in copper was measured using femtosecond time-resolved photoemission spectroscopy to within 0.3 eV above the Fermi level. By performing lifetime measurements under different surface conditions, several surface dynamical processes were investigated. In particular, an anomalous long lifetime feature, which cannot be explained with Fermi-liquid theory, was observed in the lifetime-energy curve. This feature was found originating from the photoexcitation of the strongly localized Cu 3d electrons. ©1997 American Physical Society
Characterization Of Piezoceramic Crosses With Large Range Scanning Capability And Applications For Low Temperature Scanning Tunneling Microscopy, J. A. Helfrich, Shireen Adenwalla, J. B. Ketterson, G. A. Zhitomirsky
Characterization Of Piezoceramic Crosses With Large Range Scanning Capability And Applications For Low Temperature Scanning Tunneling Microscopy, J. A. Helfrich, Shireen Adenwalla, J. B. Ketterson, G. A. Zhitomirsky
Shireen Adenwalla Papers
We have developed a large amplitude piezoceramic scanner which should have numerous applications. Scanning tunneling microscopy (STM) and other scanning probe microscopies predominantly use piezoceramics for the scanning elements. Similarly adaptive optics, high resolution lithography, and micromanipulators are other examples of research which regularly utilize piezoceramic scanners. We present a new geometry for a piezoceramic scanner which allows for both high resolution (~nanometers) and large amplitude (~400 µm) displacements. The cross-shaped geometry makes it possible to produce extremely long pieces with very high tolerances. We have shown its effectiveness by using it as the major component of a low temperature …
Scanning-Tunneling-Microscopy Study Of Pb On Si(111), D. Tang, H. E. Elsayed-Ali, J. Wendelken, J. Xu
Scanning-Tunneling-Microscopy Study Of Pb On Si(111), D. Tang, H. E. Elsayed-Ali, J. Wendelken, J. Xu
Electrical & Computer Engineering Faculty Publications
Scanning-tunneling microscopy has been used to study temperature and coverage dependence of the structure of lead on the Si(111)-7×7 surface. For low Pb coverage, the Pb atoms favored the faulted sites. The ratio between the number of Pb atoms on faulted to unfaulted sites increased after sample annealing. An energy difference of 0.05 eV associated with a Pb atom on these two sites is estimated. The mobility of Pb atoms on Si(111) was observed at a temperature as low as 260°C for a coverage of 0.1 and 1 ML. © 1995 The American Physical Society.
Reflection High-Energy Electron-Diffraction Study Of Surface Disorder And Anomalous Expansion Of Pb(100), D. Tang, H. E. Elsayed-Ali
Reflection High-Energy Electron-Diffraction Study Of Surface Disorder And Anomalous Expansion Of Pb(100), D. Tang, H. E. Elsayed-Ali
Electrical & Computer Engineering Faculty Publications
The temperature-dependent surface structural behavior of Pb(100) is studied using reflection high-energy electron diffraction. Anomalous surface expansion for temperatures between room temperature to about 500 K is observed. A high density of surface vacancies appears at temperatures above ~ 500 K. © 1994 The American Physical Society.
Hysteresis And Anchoring Energy In Ferroelectric Liquid Crystals, Yuri Panarin
Hysteresis And Anchoring Energy In Ferroelectric Liquid Crystals, Yuri Panarin
Articles
The frequency dispersion of the coercive force of Ferroelectric Liquid Crystals (FLC) cells has been detected and examined in the range of infralow (lower than 0.1 Hz) frequencies. To clarify the low-frequency dispersion, the model has been suggested, based on the arrangement of free charges and well describing the experimental curves. The method for determination of the energy of FLC anchoring at the surface, developed on the basis of the static hysteresis loop, has been proposed. The dependence of bistability and the anchoring energy upon the orientant layer thickness has experimentally been investigated.
Direct Measurements Of The Transport Of Nonequilibrium Electrons In Gold Films With Different Crystal Structures, T. Juhasz, H. E. Elsayed-Ali, G. O. Smith, C. Suárez, W. E. Bron
Direct Measurements Of The Transport Of Nonequilibrium Electrons In Gold Films With Different Crystal Structures, T. Juhasz, H. E. Elsayed-Ali, G. O. Smith, C. Suárez, W. E. Bron
Electrical & Computer Engineering Faculty Publications
The transport of femtosecond-laser-excited nonequilibrium electrons across polycrystalline and single-crystalline gold films has been investigated through time-of-flight measurements. The thicknesses of the films range from 25 to 400 nm. Ballistic electrons as well as electrons interacting with other electrons and/or with the lattice have been observed. The ballistic component dominates the transport in the thinner films, whereas the interactive transport mechanism is dominant at the upper end of the thickness range. A slower effective velocity of the interactive component is observed in the polycrystalline samples, and is assumed to arise from the presence of grain boundaries. The reflection coefficient of …