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# Search results

85 records were found.

## On the "Causality Paradox" of Time-Dependent Density Functional Theory

Comment: 21 pages

Comment: 9 pages

## Observing the spin-Coulomb drag in spin-valve devices

Comment: 11 pages, 5 figures

## Center of mass and relative motion in time dependent density functional theory

It is shown that the exchange-correlation part of the action functional $A_{xc}[\rho (\vec r,t)]$ in time-dependent density functional theory , where $\rho (\vec r,t)$ is the time-dependent density, is invariant under the transformation to an accelerated frame of reference $\rho (\vec r,t) \to \rho ' (\vec r,t) = \rho (\vec r + \vec x (t),t)$, where $\vec x (t)$ is an arbitrary function of time. This invariance implies that the exchange-correlation potential in the Kohn-Sham equation transforms in the following manner: $V_{xc}[\rho '; \vec r, t] = V_{xc}[\rho; \vec r + \vec x (t),t]$. Some of the approximate formulas that have been proposed for $V_{xc}$ satisfy this exact transformation property, others do not. Those which transform in the correct manner automatically satisfy the harmonic potential theorem", i.e. the separation of ...

## Electric Control of Spin Currents and Spin-Wave Logic

Comment: 4 pages, 3 figures, added the LL equation and the discussion on spin-wave-induced electric field, accepted by PRL

## Nonuniqueness of the Potentials of Spin-Density-Functional Theory

Comment: 4 pages, no figures

## Nonuniqueness and derivative discontinuities in density-functional theories for current-carrying and superconducting systems

Comment: revised version (typos corrected, some discussion added) to appear in Phys. Rev. B

## Current density functional theory of quantum dots in a magnetic field

We present a study of ground state energies and densities of quantum dots in a magnetic field, which takes into account correlation effects through the Current-density functional theory (CDFT). The method is first tested against exact results for the energy and density of 2 and 3 electrons quantum dots, and it is found to yield an accuracy better than $3 \%.$ Then we extend the study to larger dots and compare the results with available experimental data. The orbital and spin angular momenta of the ground state, and the evolution of the density profile as a function of the magnetic field are calculated. Quantitative evidence of edge reconstruction at high magnetic field is presented.

## Current-dependent exchange-correlation potential for dynamical linear response theory

Comment: 10 pages

## Density functional theory of the phase diagram of maximum density droplets in two-dimensional quantum dots in a magnetic field

Comment: ReVTeX 3.0