We studied the conductance renormalization and conductivity of multisubband Tomonaga-Luttinger models with inter-subband interactions. We found that, as in single-band systems, the conductance of a multi-subband system with an arbitrary number of subbands is not renormalized due to interaction between electrons. We derived a formula for the conductivity in multi-subband models. We applied it to...

The structural and electrophysical properties of epitaxial thin films strontium iridate Sr 2 IrO 4 , which were obtained by laser ablation, have been studied. Data on the effect deposition modes are presented. Electronic transport models discussed. Keywords: iris, band conductivity, hopping conductivity.

Recent experiments on the quantum Hall effect [1,2] and on the hopping transport in 2D Si MOSFETs [3] and delta-doped GaAs/AlGaAs heterostructures [4] show that prefactor so in the exponential temperature dependence of the hopping conductivity has, under certain conditions, a universal form (e/h)f(T/T0) with f ≈1 at T ≈ T0. Aleiner et al. [5] have remarked that such an effect can be due to hopp...

Temperature-dependent DC-conductivity of PbS nanoparticle films prepared by solution growth technique has been studied. Variable range hopping is identified as a predominant conduction mechanism. Density of localized states near the Fermi level is observed to decrease exponentially with increase of average grain size in the films. PACS: 81.05.Hd; 73.61.Tm; 72.20.i

The growing technological importance of conducting polymers makes the fundamental understanding of their charge transport extremely important for materials and process design. Various hopping and mobility edge transport mechanisms have been proposed, but their experimental verification is limited to poor conductors. Now that advanced organic and polymer semiconductors have shown high conductivi...

We investigate the origin of the optical ac and dc conductivity anisotropies observed in the low temperature orthorhombic phase of lightly doped, untwinned La(2 - x)Sr(x)NiO(4) single crystals. We show that these anisotropies can be naturally ascribed to the emergence of two odd parity, rotational-symmetry-broken, localized impurity acceptor states, one deeper and one shallower, resulting from ...

This paper reviews the mechanism of the conducting process of carbon nanotubes (CNTs)-reinforced polymer nanocomposites. Comparison of the two different mechanisms, the formation of the conducting network and the hopping of the electrons, are discussed. The paper also describes the critical factors that determine percolation thresholds or the conductivity of the nanocomposites. By summarizing t...

The structure and electronic properties of polymer-derived silicoboron–carbonitride ceramics are reported. Structural analysis using radial-distribution-function formalism showed that the local structure is comprised of Si tetrahedra with B, C, and N at the corners. Boron doping of SiCN leads to enhanced p-type conductivity ~0.1 V cm at room temperature!. The conductivity variation with tempera...