## Search

Now showing items 1-10 of 78

#### Effects of bonding type and interface geometry on coherent transport through the single-molecule magnet Mn-12

(American Physical Society, 2010-03)

We examine theoretically coherent electron transport through the single-molecule magnet Mn-12, bridged between Au(111) electrodes, using the nonequilibrium Green's function method and the density-functional theory. We ...

#### Effect of pressure on a defect-related band-resonant vibrational mode in implanation-disordered GaAs

(American Physical Society, 1994-10)

We have used hydrostatic pressure as a means for studying a resonant Raman mode observed at 47 cm(-1) in highly disordered, ion implanted, unannealed GaAs. The mode shifts weakly (-0.07 +/- 0.15 cm(-1)/GPa), supporting an ...

#### Shot noise in nanoscale conductors from first principles

(American Physical Society, 2003-04)

We describe a field-theoretic approach to calculate quantum shot noise in nanoscale conductors from first principles. Our starting point is the second-quantization field operator to calculate shot noise in terms of single ...

#### Path-integral approach to the Hubbard model

(American Physical Society, 1991-02)

A path-integral approach to the Hubbard model is developed for the whole range of the coupling strength U. At half filling, the strong-coupling results are readily reproduced within the simple Gaussian fluctuations. The ...

#### Transmutation of the vicinal surface exponent due to gravity

(American Physical Society, 1988-04)

Near the edge of a facet, vicinal surfaces curve away from the plane with exponent (3/2. With gravity normal to the facet the exponent may change to 3. Generally, there will be a crossover from 3 to (3/2 as the facet edge ...

#### Koster-Slater model for the interface-state problem

(American Physical Society, 2000-10)

A Koster-Slater approach to the problem of localized states at semiconductor interfaces has been developed. It allows us to relate the existence and/or the energy position of interface states to some essential bulk features ...

#### Finite-basis many-electron approximation to the Anderson model

(American Physical Society, 1990-03)

A relatively simple many-electron basis is used to construct a matrix for the Anderson impurity Hamiltonian. The basis states are each valid in the thermodynamic limit. The approximate ground-state energy compares well ...

#### Transport in nanoscale conductors from first principles

(American Physical Society, 2002-01)

We describe a first-principles atomistic approach to calculate the electronic and atomic dynamics of nanoscale conductors under steady-state current flow. The approach is based on a self-consistent solution of the ...

#### Power spectrum of the current in systems with a conserved density

(American Physical Society, 1991-09)

Motivated by recent studies of model sandpiles, the power spectrum S of the current in dissipative dynamical systems with a conserved density is investigated. In contrast to self-organized criticality exhibited in certain ...

#### Effects of next-nearest-neighbor interactions on the orientation dependence of step stiffness: Reconciling theory with experiment for Cu(001)

(American Physical Society, 2004-12)

Within the solid-on-solid (SOS) approximation, we carry out a calculation of the orientational dependence of the step stiffness on a square lattice with nearest- and next-nearest-neighbor interactions. At low temperature ...