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| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 1 |
 | Wu, Yong-Shi | Braid group, gauge invariance, and topological order | Topological order in two-dimensional systems is studied by combining the braid group formalism with a gauge invariance analysis. We show that flux insertions (or large gauge transformations) pertinent to the toroidal topology induce automorphisms of the braid group, giving rise to a unified algebrai... | Braid group; Topological order; Zero temperature; Two-dimensional systems | 2006-07 |
| 2 |
 | Gerton, Jordan | Fluorescence near-field microscopy of DNA at Sub-10A nm resolution | We demonstrate apertureless near-field microscopy of single molecules at sub-10 nm resolution. With a novel phase filter, near-field images of single organic fluorophores were obtained with ~sixfold improvement in the signal-to-noise ratio. The improvement allowed pairs of molecules separated by ~... | 2006-12 | |
| 3 |
 | Mishchenko, Eugene | Generation of spin current by Coulomb drag | Coulomb drag between two quantum wires is exponentially sensitive to the mismatch of their electronic densities. The application of a magnetic field can compensate this mismatch for electrons of opposite spin directions in different wires. The resulting enhanced momentum transfer leads to the conv... | Spin current; Coulomb drag; Quantum wires | 2006-12 |
| 4 |
 | Rogachev, Andrey | Magnetic-field enhancement of superconductivity in ultranarrow wires | We study the effect of an applied magnetic field on sub-10-nm wide MoGe and Nb superconducting wires. We find that magnetic fields can enhance the critical supercurrent at low temperatures, and do so more strongly for narrower wires. We conjecture that magnetic moments are present, but their pair-... | Ultranarrow wires; Magnetic-field enhancement | 2006-09 |
| 5 |
 | Mishchenko, Eugene | Optical conductivity of a two-dimensional electron liquid with spin-orbit interaction | The interplay of electron-electron interactions and spin-orbit coupling leads to a new contribution to the homogeneous optical conductivity of the electron liquid. The latter is known to be insensitive to many-body effects for a conventional electron system with parabolic dispersion. The parabolic... | Optical conductivity; Electron liquid; Spin-orbit coupling | 2006-08 |
| 6 |
 | Liu, Feng | Pressure-induced transition in magnetoresistance of single-walled carbon nanotubes | We applied hydrostatic pressure (up to 10 GPa) to single-walled carbon nanotube bundles at low temperature (down to 2 K) to measure their magnetoresistance (MR) in a field up to 12 T. We found a pressure-induced transition in MR from positive to negative in the high-field regime. The onset of the tr... | Single-walled carbon nanotubes; Pressure-induced | 2006-07 |
| 7 |
 | Liu, Feng | Quantum size effect on adatom surface diffusion | Using scanning tunneling microscopy, we demonstrate that the nucleation density of Fe islands on the surface of nanoscale Pb films oscillates with the film thickness, providing a direct manifestation of the quantum size effect on surface diffusion. The Fe adatom diffusion barriers were derived to be... | Quantum size effect; QSE; Adatoms; Surface diffusion; Fe islands; Nanoscale metallic structures; Epitaxial growth; Pb films | 2006-12 |
| 8 |
 | Liu, Feng | Surface mobility difference between Si and Ge and its effect on growth of SiGe alloy films and islands | Based on first-principles calculations of surface diffusion barriers, we show that on a compressive Ge(001) surface the diffusivity of Ge is 102-103 times higher than that of Si in the temperature range of 300 to 900 K, while on a tensile surface, the two diffusivities are comparable. Consequently, ... | Surface mobility; SiGe film; Strained thin films; Surface diffusion barriers | 2006-01 |
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