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| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 1 |  | Ailion, David Charles | 109Ag NMR investigation of atomic motions in the incommensurate and paraelectric phases of proustite (Ag3AsS3) | 109Ag NMR line shape, T1 , Hahn spin echo, and Carr-Purcell-Meiboom-Gill ~CPMG! spin-echo measurements were performed in proustite (Ag3AsS3) between 420 and 47 K in order to understand the role of atomic motions in phase transitions in a system containing an incommensurate phase. These measurements ... | NMR; Atomic motion; Proustitie; Phase transitions; Line shape | 2000 |
| 2 |  | Vardeny, Zeev Valentine; Raikh, Mikhail E. | Emission spectrum of a dipole in a semi-infinite periodic dielectric structure: effect of the boundary | The emission spectrum of a dipole embedded in a semi-infinite photonic crystal is calculated. For simplicity we study the case in which the dielectric function is sinusoidally modulated only along the direction perpendicular to the boundary surface plane. In addition to oscillations of the emission... | Emission spectrum; Dipole; Periodic dielectric structure | 2000-07 |
| 3 |  | Vardeny, Zeev Valentine | Film morphology and photophysics of polyfluorene | We have studied the interplay between photophysics and film morphology of poly(9,9-dioctyl)fluorene (PFO) using a variety of optical probes. Upon slowly warming a spin-cast PFO film from 80 to 300 K, a fraction of the sample is transformed into a different solid phase, the ß phase. Absorption and e... | Polyfluorene; Photophysics; Film morphology | 2000-12 |
| 4 |  | Liu, Feng | First-principles study of impurity segregation in edge dislocations in Si | Using ab initio calculations, the segregation of As, Ga, and Ge atoms in the core regions of perfect edge dislocations in Si is examined. When all nearest neighbors of an impurity are Si atoms, As favors the core site at maximum compression and has a segregation energy of 0.25 eV/atom. Ga and Ge im... | First-principles; Impurity segregation; Edge dislocations | 2000-01 |
| 5 |  | Liu, Feng | Magnetization on rough ferromagnetic surfaces | Using Ising-model Monte Carlo simulations, we show a strong dependence of surface magnetization on surface roughness. On ferromagnetic surfaces with spin-exchange coupling larger than that of the bulk, the surface magnetic ordering temperature decreases toward the bulk Curie temperature with incre... | Ferromagnetic surfaces; Surface magnetization | 2000-11 |
| 6 |  | Vardeny, Zeev Valentine; Raikh, Mikhail E. | Mesoscopic cooperative emission from a disordered system | We study theoretically the cooperative light emission from a system of N»1 classical oscillators confined within a volume with spatial scale L much smaller than the radiation wavelength λο=2rrc/ω0. We assume that the oscillator frequencies are randomly distributed around a central frequency ω... | Mesoscopic cooperative emission; Disordered systems; Oscillators | 2000-05 |
| 7 |  | Wu, Yong-Shi; Raikh, Mikhail E. | Role of spin-orbit coupling in the metal-insulator transition in two-dimensional systems | We propose an experiment, which would allow us to pinpoint the role of spin-orbit coupling in the metal-nonmetal transition observed in a number of two-dimensional systems at low densities. Namely, we demonstrate that in a parallel magnetic field the interplay between the spin-orbit coupling and the... | Spin-orbit coupling; Metal-insulator transitions | 2000-04 |
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