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# Search results

456 records were found.

## Dynamic Scaling in Epitaxial Growth

Comment: 36 pages, Revtex, minor changes

## Boltzmann transport and residual conductivity in bilayer graphene

A Drude-Boltzmann theory is used to calculate the transport properties of bilayer graphene. We find that for typical carrier densities accessible in graphene experiments, the dominant scattering mechanism is overscreened Coulomb impurities that behave like short-range scatterers. We anticipate that the conductivity $\sigma(n)$ is linear in $n$ at high density and has a plateau at low density corresponding to a residual density of $n^* = \sqrt{n_{\rm imp} {\tilde n}}$, where ${\tilde n}$ is a constant which we estimate using a self-consistent Thomas-Fermi screening approximation to be ${\tilde n} \approx 0.01 ~q_{\rm TF}^2 \approx 140 \times 10^{10} {\rm cm}^{-2}$. Analytic results are derived for the conductivity as a function of the charged impurity density. We also comment on the temperature dependence of the bilayer conductivity.

## The $p_{x,y}$-orbital counterpart of graphene: cold atoms in the honeycomb optical lattice

We study the ground state properties of the interacting spinless fermions in the $p_{x,y}$-orbital bands in the two dimensional honeycomb optical lattice, which exhibit different novel features from those in the $p_z$-orbital system of graphene. In addition to two dispersive bands with Dirac cones, the tight-binding band structure exhibits another two completely flat bands over the entire Brillouin zone. With the realistic sinusoidal optical potential, the flat bands acquire a finite but much smaller band width compared to the dispersive bands. The band flatness dramatically enhanced interaction effects giving rise to various charge and bond ordered states at commensurate fillings of $n=\frac{i}{6} (i=1 \sim 6)$. At $n=1/6$, the many-body ground states can be exactly solved as the close packed hexagon states which can be stabilized e...

## Transport in suspended graphene

Comment: 6 pages, 4 figures. Related papers available at http://www.physics.umd.edu/cmtc/

## Ground-state of graphene in the presence of random charged impurities

Comment: Final version, accepted for publication in Phys. Rev. Lett

## The enigma of the nu=0 quantum Hall effect in graphene

Comment: Minor revisions with added references. 6 pages. Published version

## Predicted mobility edges in one-dimensional incommensurate optical lattices: An exactly solvable model of Anderson localization

Comment: 5 pages, 5 figures

## Bosons in a double-well potential: Understanding the interplay between disorder and interaction in a simple model

Comment: Published version, 4 pages, 4 figures

## Anomalous Hall response of topological insulators

The anomalous Hall effect due to the surface conduction band of 3D topological insulators with an out-of-plane magnetization is \textit{always} dominated by an intrinsic topological term of the order of the conductivity quantum. We determine the contributions due to the band structure, skew scattering, side jump and magnetic impurities on the same footing, demonstrating that the topological term, renormalized due to disorder, overwhelms all other terms, providing an unmistakable signature of $Z_2$ topological order. Uncharacteristically, skew scattering contributes in the Born approximation as well as in the third order in the scattering potential, while in addition to the side-jump scattering term we identify a novel intrinsic side-jump term of a similar magnitude. These, however, never overwhelm the topological contribution.

## Low-noise conditional operation of singlet-triplet coupled quantum dot qubits

Comment: 4 pages, 4 figures