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| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 1 |  | Liu, Feng | Creation of "quantum platelets" via strain-controlled self-organization at steps | We demonstrate, by both theory and experiment, the strain-induced self-organized formation of "quantum platelets," monolayer-thick islands of finite dimensions. They form at the early stage of heteroepitaxial growth on a substrate with regularly spaced steps, and align along the steps. In the direc... | Quantum platelets; Strain-controlled self-organization; Monolayer-thick islands; Heteroepitaxial growth | 2000-12 |
| 2 |  | Liu, Feng | Equilibrium shape of two-dimensional islands under stress | We show that the equilibrium shape anisotropy of two-dimensional islands in heteroepitaxial growth depends on island size, a consequence of the presence of strain. Even in homoepitaxy, in which the island shape has conventionally been equated with the ratio of step energies, a substrate surface str... | Two-dimensional islands; Equilibrium shape; Heteroepitaxial growth; Homoepitaxy | 2000-08 |
| 3 |  | Sokolsky, Pierre | Evidence for changing of cosmic ray composition between 10^17 and 10^18 eV from multicomponent measurements | The average mass composition of cosmic rays with primary energies between 1017 and 1018 eV has been studied using a hybrid detector consisting of the High Resolution Fly's Eye (HiRes) prototype and the MIA muon array. Measurements have been made of the change in the depth of shower maximum and the... | Extensive air showers; Fluorescence; Energy spectrum; Muon density; Cherenkov light | 2000-05 |
| 4 |  | Wu, Yong-Shi | Holography and noncommutative Yang-Mills theory | In this Letter a recently proposed gravity dual of noncommutative Yang-Mills theory is derived from the relations between closed string moduli and open string moduli recently suggested by Seiberg and Witten. The only new input one needs is a simple form of the running string tension as a function ... | Noncommutativity; String theory; Gravity dual | 2000-03 |
| 5 |  | Mishchenko, Eugene | Nonlinear voltage dependence of the shot noise in mesoscopic degenerate conductors with strong electron-electron scattering | It is shown that measurements of zero-frequency shot noise can provide information on electron-electron interaction, because the strong interaction results in the nonlinear voltage dependence of the shot noise in metallic wires. This is due to the fact that the Wiedemann-Franz law is no longer vali... | Shot noise; Degenerate conductors | 2000-11 |
| 6 |  | Liu, Feng | Thermal roughening of a thin film: a new type of roughening transition | The equilibrium thermal roughening of thin Ge layers (one and two monolayers) deposited on Si(001) has been investigated with low-energy electron microscopy. A Ge-coverage-dependent roughening is observed. For two monolayers, the temperature at which imaging contrast is lost due to surface roughness... | Thermal roughening; Roughening transition; Heteroepitaxial growth | 2000-09 |
| 7 |  | Vardeny, Zeev Valentine | Ultrafast spectroscopy of even-parity states in ∏-conjugated polymers | Relaxation dynamics of even parity (Ag) states in poly(p-phenylene vinylene) derivatives are studied using a novel fsec transient spectroscopy, in which two different excitation pulses successively generate odd parity (1 1Bµ) excitons at 2.2 eV and then reexcite them to higher Ag states. For reexci... | pi-conjugated polymers; Ultrafast spectroscopy; PPV; Relaxation dynamics | 2000-09 |
| 8 |  | Liu, Feng | Unique dynamic appearance of a Ge-Si Ad-dimer on Si(001) | We carry out a comparative study of the energetics and dynamics of Si-Si, Ge-Ge, and Ge-Si ad-dimers on top of a dimer row in the Si(001) surface, using first-principles calculations. The dynamic appearance of a Ge-Si dimer is distinctively different from that of a Si-Si or Ge-Ge dimer, providing a ... | Ge-Si Ad-dimer; Si(001); First-principles calculations; Energetics | 2000-12 |
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