"Where are the carriers?" The nation's leaders seem to ask that question whenever a crisis perceived to involve vital U.S. interests develops. According to the conventional wisdom, the aircraft carrier--because of its mobility, its versatility, and the capabilities that it affords the United States, particularly that of projecting air power without relying on overseas bases--is the best militar...

An unusual increase in the Seebeck coefficient with increasing charge carrier density is observed in pentacene thin film transistors. This behavior is interpreted as being due to a transition from hopping transport in static localized states to bandlike transport, occurring at temperatures below ∼250  K. Such a transition can be expected for organic materials in which both static energetic diso...

The doping dependence of specific heat and magnetic susceptibility has been investigated for Li(x)ZrNCl superconductors derived from a band insulator. As the carrier concentration is decreased, the anisotropy of superconducting gap changes from highly anisotropic to almost isotropic. It was also found that, upon reducing carrier density, the superconducting coupling strength and the magnetic su...

background hepatitis b virus (hbv) is one of the most common chronic viral infections in the world. iran has a low to intermediate hbv prevalence and approximately 1.5 million people are living with hbv infection. the impact of hbv in iran is unknown and given the very low levels of alcohol consumption, this region provides an opportunity to examine the impact of isolated chronic hbv infection....

Coherent detection techniques are used almost exclusively in radio astronomy, while direct detection predominates in the optical and infrared bands. The millimeter, submillimeter, and far–infrared bands represent a transition region from coherent to direct detection. In this paper, the relative merits of coherent and direct detection in the mm through far–IR are compared, the techniques of cohe...

In this paper we construct a holomorphic polynomial first order differential representation of the Lie algebra which is the semidirect sum hn o sp(2n,R), on the manifold Cn × Dn, different from the extended metaplectic representation [6]. The case n = 1 corresponding to the Lie algebra h1 o su(1, 1) was considered in [3]. The natural framework of such an approach is furnished by the so called c...

We have studied the photoexcited carrier relaxation dynamics in the Kondo insulator SmB6 and the heavy fermion metal YbAgCu4 as a function of temperature and excitation level. The dynamic response is found to be both strongly temperature dependent and nonlinear. The data are analyzed with a Rothwarf-Taylor bottleneck model, where the dynamics are governed by the presence of a narrow gap in the ...

The three-dimensional confinement of electrons and holes in the semiconductor quantum dot (QD) structure profoundly changes its density of states compared to the bulk semiconductor or the thin-film quantum well (QW) structure. The aim of this paper is to theoretically investigate the microwave properties of InAs/InP(311B) QD lasers. A new expression of the modulation transfer function is derive...

A topological insulator is a new phase of quantum matter with a bulk band gap and spin-polarized surface states, which might find use in applications ranging from electronics to energy conversion. Despite much exciting progress in the field, high-yield solution synthesis has not been widely used for the study of topological insulator behavior. Here, we demonstrate that solvothermally synthesize...

We have studied the intense chirped pulse excitation of a molecule coupled with a dissipative environment taking into account electronic coherence effects. We considered a two-state electronic system with relaxation treated as a diffusion on electronic potential energy surfaces. This relaxation model enables us to trace continuously the transition from a coherent population transfer to incohere...