The dynamical Green's function and energy spectrum of a 2D symmetric quantum double-dot system on a planar host in a normal magnetic field are analyzed here, representing the two dots by Dirac delta function potentials. The proliferation of energy levels due to Landau quantization is examined in detail.

Electronic transport through a straight, parabolically confined, quantum wire with an attractive impurity and a transverse electric field is investigated via the Feshbach coupled-channel theory. The impurity is modeled by a δ- function potential in the propagation direction while it is Gaussian in the transverse direction. In the presence of an impurity, the transmission probability of the wire may exhibit resonances of the Fano type (which is the result of the interference between background transmission and transmission via a quasibound state created in the impurity). It is shown here that increasing the field strength from zero causes displacement of the confining potential, thereby inducing a shifting of the impurity across the channel and therefore influencing the resonance structure. As the center of the confining potential approaches the center of the impurity, the coupling of the (first) propagating state with the quasibound state of the second channel gradually decreases, resulting in a decrease of the resonance width. For a particular value of the field strength the resonance width shrinks to zero and the Fano profile collapses. The resonance energy is also examined as a function of the electric field strength.

The energy loss of a fast charged particle probe incident on a two-dimensional graphene sheet is examined here. The fast particle motion is taken to be perpendicular to the 2D graphene sheet, which is considered to be in the degenerate limit of zero temperature. The response dynamics of the 2D graphene layer are described in the random phase approximation and the energy loss for particle motion perpendicular to the 2D graphene layer is calculated as a function of the velocity of the charged particle.

We examine the drift instability of a magnetized 2D electron plasma in a weak periodic potential, taking account of a steady current. In this, we treat a strong magnetic field inducing Landau quantization, and analyze both the interand intra-Landau band aspects of the magneto-plasmon spectrum within the framework of the random phase approximation, determining the occurrence of magnetoplasmon instability as a function of drift speed.

The effect of plasma power on the structural properties of hydrogenated nanocrystalline cubic silicon carbide (nc-3C-SiC:H) films deposited by very high frequency plasma-enhanced chemical vapor deposition was investigated. The film structure was strongly influenced by the plasma power due to the change in atomic hydrogen density in the vapor phase. A high plasma power of above 170 W (2.17 W/cm(2)) is required for depositing nc-3C-SiC:H films. [DOI: 10.1143/JJAP.47.3368]

We have successfully deposited nanocrystalline cubic silicon carbide (nc-3C-SiC:H) films at a low substrate temperature of 360 °C by very high-frequency plasma-enhanced chemical vapor deposition using monomethylsilane and hydrogen. Spectroscopic ellipsometry revealed that the crystalline volume fraction of the films increased from 69 to 92% with increasing hydrogen dilution ratio from 100 to 500. We found that the dark conductivity of the films was strongly affected by the crystalline volume fraction. A high deposition rate of 0.15 nm/s was achieved under a low hydrogen dilution ratio of 100.

A non-stationary process of polariton-mode excitation in a two-dimensional excitonic layer (at z=0) by a light-wave extinction front is analyzed here using the electromagnetic dyadic Green's function formalism. The electromagnetic response of the 2D layer includes inhomogeneous radiative exciton-polariton modes corresponding to complex poles of the matrix Green's function.

We analyze the effects of a magnetic field on acoustic surface plasmons.

Hydrogenated nanocrystalline cubic silicon carbide (nc-SiC:H) films were successfully deposited on glass substrates at low substrate temperatures below 300 degC by hot wire chemical vapor deposition (HWCVD) and very high frequency plasma chemical vapor deposition (VHF-PECVD). We investigated structural properties of the films by spectroscopic ellipsometry and TEM observations. Photo-sensitivity of the films deposited by VHF-PECVD was higher than that of the films deposited by HWCVD. The secondary ion mass spectroscopy measurement revealed that the low photo-sensitivity of the films deposited by HWCVD was due to the metal contamination from the hot wires

Carbon nanotube sensors detected anti-hemagglutinin binding to immobilized hemagglutinins. An ultra-sensitive detection method for antibodies or antigens in serum is required. Hemagglutinins were immobilized on the reverse side of a carbon nanotube, thereby producing a source and a drain. Electrode pads covered each edge of the nanotube. The I–V curves between the source and the drain were measured after incubation of anti-hemagglutinins with immobilized hemagglutinins in a buffered solution on the reverse side of the nanotube. The sensitivity of the CNT sensor was higher than that of an ELISA system. This method constitutes a new tool to analyze interaction among biomolecules on a substrate.