We calculate Coulomb scattering lifetimes of electrons in two-subband quantum wires and in double-layer quantum wells by obtaining the quasiparticle self-energy within the framework of the random-phase approximation for the dynamical dielectric function. We show that, in contrast to a single-subband quantum wire, the scattering rate in a two-subband quantum wire contains contributions from both...

in this paper, using the tight-binding model, we extend the real-space renormalization group method to time-dependent hamiltonians. we drive the time-dependent recursion relations for the renormalized tight-binding hamiltonian by decimating selective sites of lattice iteratively. the formalism is then used for the calculation of the local density of electronic states for a one dimensional quant...

The electronic properties of a particular class of domain walls in gapped graphene are investigated. We show that they can support mid-gap states which are localized in the vicinity of the domain wall and propagate along its length. With a finite density of domain walls, these states can alter the electronic properties of gapped graphene significantly. If the mid-gap band is partially filled,th...

We show that long-ranged superconducting order is not necessary to guarantee the existence of Majorana fermion zero modes at the ends of a quantum wire. We formulate a concrete model, which applies, for instance, to a semiconducting quantum wire with strong spin-orbit coupling and Zeeman splitting coupled to a wire with algebraically decaying superconducting fluctuations. We solve this model by...

It has been proposed that localized zero-energy Majorana states can be realized in a two-dimensional network of quasi-one-dimensional semiconductor wires that are proximity coupled to a bulk superconductor. The wires should have strong spin-orbit coupling with appropriate symmetry, and their electrons should be partially polarized by a strong Zeeman field. Then, if the Fermi level is in an appr...

Abstract In this paper we will give a short rewiew about the conductance of a mesoscopic waveguide strip with a few impurities. Green-function method is used allowing to treat systems with low number of impurities, not only the completly clean case. Investigating a wire containing Diracdelta potentials (modelling the impurities) we found that increasing number of impurities can cause a transiti...

ASAI, H., YAMADA, s., and RTKUI, T.: 'Narrow two-dimensional electron gas channels in GaAs/AlGaAs sidewall interfaces by selective growth', Appl. Phys. Lett., 1987,51, pp. 1518-1520 YAMADA, s., ASAI, H., FUKAI, Y. K., and FUKUI, T.: 'Magnetoconductances in on-facet AlGaAs/GaAs submicron channels'. Collected abstracts 19th int. conf. phys. semiconductors, Warsaw, 1988, p. 29 FUKAI, Y. K., YAMADA...

A theory of drift–diffusion transport in a low–dimensional field effect transistor is developed. Two cases of a semiconductor nanowire and a single–wall nanotube are considered using self-consistent electrostatics to obtain a general expression for transconductance. This quantum wire channel device description is shown to differ from classical device theory because of the specific nanowire char...