The low energy spectrum of finite size metallic single-walled carbon nanotubes (SWNTs) is determined. Starting from a tight binding model for the p<Subscript>z</Subscript> electrons, we derive the low energy Hamiltonian containing all relevant scattering processes resulting from the Coulomb interaction, including the...</subscript>

The incommensurate composite systems M<Subscript>14</Subscript>Cu<Subscript>24</Subscript>O<Subscript>41</Subsc ript> (M=Ca, Sr, La) are based on two fundamental structural units: CuO<Subscript>2</Subscript> chains and Cu<Subscript>2</Subscript>O<Subscript>3</Subscript> ladders. We present electronic structure calculations within density functional theory in order to address the interrelations between chains and ladders. The...</subscript></subscript></subscript><//subsc></subscript></subscript></subscript>

Motivated by current interest in strongly correlated quasi-one-dimensional (1D) Luttinger liquids subject to axial confinement, we present a novel density-functional study of few-electron systems confined by power-low external potentials inside a short portion of a thin quantum wire. The theory...

We review and extend the composite fermion theory for semiconductor quantum dots in high magnetic fields. The mean-field model of composite fermions is unsatisfactory for the qualitative physics at high angular momenta. Extensive numerical calculations demonstrate that the microscopic CF theory,...

We calculate the damping γ<Subscript>q</Subscript> of collective density oscillations (zero sound) in a one-dimensional Fermi gas with dimensionless forward scattering interaction F and quadratic energy dispersion k<Superscript>2</Superscript> / 2 m at zero temperature. Using standard many-body perturbation theory, we obtain γ<Subscript>q</Subscript> from the...</subscript></superscript></subscript>

We present a low energy-theory for non-linear transport in finite-size interacting single-wall carbon nanotubes. It is based on a microscopic model for the interacting p<Subscript>z</Subscript> electrons and successive bosonization. We consider weak coupling to the leads and derive equations of motion for the reduced...</subscript>

We employ density-functional theory to calculate realistic parameters for an extended Hubbard model of the molecular metal TTF-TCNQ. Considering both intra- and intermolecular screening in the crystal, we confirm the importance of the suspected longer-range Coulomb interactions along the...

We consider one-dimensional (1D) interacting spinless fermions with a non-linear spectrum in a clean quantum wire (non-linear bosonization). We compute diagrammatically the 1D dynamical structure factor, S(ω,q), beyond the Tomonaga approximation focusing on it's tails, |ω| ≫vq, i.e. the...