We propose a superlattice consisting of graphene and monolayer thick Si sheets and investigate it using a first-principles density functional theory. The Si layer is found to not only strengthen the interlayer binding between the graphene sheets compared to that in graphite, but also inject electrons into graphene, yet without altering the most unique property of graphene: the Dirac fermion-lik...

We have studied doped superlattices of GaAs/AlGaAs composition. When the doping atoms are introduced into the barriers surrounding the superlattice, as well as to the inner ones, but with half of the concentration, the photoluminescence due to interband transitions from extended superlattice states is detected. This is demonstrated by a study of the sample’s photoluminescence in a magnetic fiel...

In this paper we present a model system built out of artificially layered materials, allowing us to understand the interrelation magnetic phases with metallic-insulating phase at long length scales, and enabling new strategies for design control materials in devices. The artificial consists superlattices made ${\mathrm{SmNiO}}_{3}$ ${\mathrm{NdNiO}}_{3}$ layers, -- two members fascinating rare ...

Two-dimensional materials on metallic surfaces or stacked one top of the other can form a variety moir\'e superstructures depending possible parameter and symmetry mismatch misorientation angle. In most cases, such as incommensurate lattices identical but with small twist angle, common periodicity may be very large, thus making numerical simulations prohibitive. We propose here general procedur...

We demonstrate the physical mechanism of optical Tamm states using the phase properties of the photonic crystals. Based on such mechanism, we propose an efficient way that can precisely produce optical Tamm states at specific frequencies. Moreover, we show that dielectric photonic crystals and single-negative materials can be effectively connected through their reflection phase. Two kinds of on...

We present an experimental investigation of superlattice patterns generated on the surface of a fluid via parametric forcing with two commensurate frequencies. The spatiotemporal behavior of four qualitatively different types of superlattice patterns is described in detail. These states are generated via a number of different three-wave resonant interactions. They occur either as symmetry-break...

The dynamics of an electron in a one-dimensional superlattice is investigated under the action of a THz electric field. The density matrix equations of motion within a single miniband are solved using a relaxationtime approximation for scattering. The electronic response to THz radiation is obtained by calculating the dipole moment, whence we compute the power dissipated, the THz reflection coe...

Variable-temperature synchrotron x-ray powder diffraction data from dehydrated Na 6 ͓Al 6 Si 6 O 24 ] reveal a structural phase transition that involves both the commensurate ordering of the extra-framework Na cations and a one-dimensional incommensurate modulation of the framework. Peak splittings and superlattice reflections implicate an orthorhombically-distorted volume-doubled supercell at r...

Electronic transport is theoretically investigated in laterally confined semiconductor superlattices using the formalism of nonequilibrium Green’s functions. Velocity-field characteristics are calculated for nanowire superlattices of varying diameters, from the quantum dot superlattice regime to the quantum well superlattice regime. Scattering processes due to electron-phonon couplings, phonon ...

A two-dimensional superlattice photonic crystal structure is investigated in which the holes in adjacent rows of a triangular lattice alternate between two different radii. The superimposition of a superlattice on a triangular lattice is shown to reduce the photonic bandgap, introduce band splitting, and change the dispersion contours so that dramatic effects are seen in the propagation, refrac...