We study the transport properties of defective single-walled armchair carbon nanotubes (CNTs) on a mesoscopic length scale. Monovacancies and divancancies are positioned randomly along CNT. The calculations based fast, linearly scaling recursive Green's function formalism that allows us to treat large systems quantum-mechanically. electronic structure CNT is described by density-functional-based tight-binding model. determine influence defects transmission for given defect density...

Abstract We propose a novel type of phononic crystal for which the materials parameters are continuous functions space coordinates without discontinuities corresponding to seamless fusion constituent within lattice. With help an adaptation this fundamental approach, we extend well-established concept crystals, allowing investigation transition from conventional crystals with regulated step-like parameter function realm so-called crystals. Our study is based on first-principle theory assisted...

We theoretically investigate the influence of defect-induced long-range deformations in carbon nanotubes on their electronic transport properties. To this end we perform numerical ab-initio calculations using a density-functional-based tight-binding model for various tubes with vacancies. The geometry optimization leads to change atomic positions. There is strong reconstruction atoms near defect (called 'distortion') and there an additional deformation. impact both structural features...

We investigate the electronic transport properties of semiconducting ($m$,$n$) carbon nanotubes (CNTs) on mesoscopic length scale with arbitrarily distributed realistic defects. The study is done by performing quantum calculations based recursive Green's function techniques and an underlying density-functional-based tight-binding model for description structure. Zigzag CNTs as well chiral different diameter are considered. Different defects exemplarily represented monovacancies divacancies....

Abstract We study electronic quantum transport (QT) in graphene nanoribbon (GNR) networks on mesoscopic length scales. focus zigzag GNRs and investigate the conductance properties of statistical networks. To this end we use a density-functional-based tight-binding model to determine structure QT theory calculate properties. then introduce new efficient network decimation algorithm that reduces complexity generic three-dimensional GNR compare our results semi-classical calculations based...

Experimental results from literature show equidistant energy levels in thin Bi films on surfaces, suggesting a harmonic oscillator description. Yet this conclusion is by no means imperative, especially considering that any measurement only yields finite range and with nonzero uncertainty. Within study we review isospectral potentials the investigate applicability of hypothesis to recent measurements. First, describe experimental model, obtaining realistic size depth resulting quantum well....

The cochlea forms a key element of the human auditory system in temporal bone. Damage to continues produce significant impairment for sensory reception environmental stimuli. To improve this impairment, optical cochlear implant new research approach. A prerequisite method is understand how light propagation, as well scattering, reflection, and absorption, takes place within cochlea. We offer study distribution through phantom materials which have objective mimic behavior bone Monte-Carlo...

The cochlea forms a key element of the human auditory system in temporal bone. Damage to continues produce significant impairment for sensory reception environmental stimuli. To improve this impairment, optical cochlear implant new research approach. A prerequisite method is understand how light propagation, as well scattering, reflection and absorption, takes place within cochlea. We offer study distribution through phantom materials Monte-Carlo simulations. calculation an angular after...

Experiments generally only offer access to certain output parameters or spectra. When performing device simulations, we often assume that agreement of theoretical and experimental means the model describes well. However, this conclusion is by no mandatory. Here, show an example a Bi quantum film where measurements equidistant energy levels. Though suggests harmonic oscillator potential, variety alternative potentials with spectra may also describe structure, especially considering finite...

Abstract Experimental results from literature show equidistant energy levels in thin Bi films on surfaces, suggesting a harmonic oscillator description. Yet this conclusion is by no means imperative, especially considering that any measurement only yields finite range and with nonzero uncertainty. Within study we review isospectral potentials the investigate applicability of hypothesis to recent measurements. First, describe experimental model, obtaining realistic size depth resulting...