Conductance of telescoped double-walled nanotubes from perturbation calculations

Tamura, R.

doi:10.1103/physrevb.82.035415

Cited by 10 publications

(23 citation statements)

References 54 publications

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“…Finally, the output calculations are represented by Chemcraft program as IR spectrum. The following rules were considered while proposing a stable GO structure [ 38 – 42 ]. First, GO contains sp 2 and sp 3 orbital hybridization.…”

Section: Discussionmentioning

confidence: 99%

Photo-Response of Functionalized Self-Assembled Graphene Oxide on Zinc Oxide Heterostructure to UV Illumination

2016

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Convective assembly technique which is a simple and scalable method was used for coating uniform graphene oxide (GO) nanosheets on zinc oxide (ZnO) thin films. Upon UV irradiation, an enhancement in the on-off ratio was observed after functionalizing ZnO films by GO nanosheets. The calculations of on-off ratio, the device responsivity, and the external quantum efficiency were investigated and implied that the GO layer provides a stable pathway for electron transport. Structural investigations of the assembled GO and the heterostructure of GO on ZnO were performed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The covered GO layer has a wide continuous area, with wrinkles and folds at the edges. In addition, the phonon lattice vibrations were investigated by Raman analysis. For GO and the heterostructure, a little change in the ratio between the D-band and G-band was found which means that no additional defects were formed within the heterostructure.

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Section: Discussionmentioning

confidence: 99%

Photo-Response of Functionalized Self-Assembled Graphene Oxide on Zinc Oxide Heterostructure to UV Illumination

2016

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“…In addition, TDWNTs enable us to measure the interlayer conductance more directly than un-telescoped DWNTs. 11 Among the reported theo-retical work on TDWNTs, [12][13][14][15] , there are controversial results regarding the conductance of a TDWNT composed of (10,10) and (5,5) armchair nanotubes. Compared to a quantum conductance G 0 = 2e 2 /h, the maximum conductance was found to be 2G 0 based on tight binding (TB) model calculations, but only G 0 based on first-principles calculations.…”

Section: Introductionmentioning

confidence: 99%

“…Compared to a quantum conductance G 0 = 2e 2 /h, the maximum conductance was found to be 2G 0 based on tight binding (TB) model calculations, but only G 0 based on first-principles calculations. 14,15 Landauer's formula was used in these calculations, so the conductance in units of G 0 equals the sum of the transmission rates. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Relation between dispersion lines and conductance of telescoped armchair double-wall nanotubes analyzed using perturbation formulas and first-principles calculations

Tamura

2012

Phys. Rev. B

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The Landauer's formula conductance of the telescoped armchair nanotubes is calculated with the Hamiltonian defined by first-principles calculations (SIESTA code). Herein, partially extracting the inner tube from the outer tube is called 'telescoping'. It shows a rapid oscillation superposed on a slow oscillation as a function of discrete overlap length L − 1 2 a with an integer variable L and the lattice constant a. Considering the interlayer Hamiltonian as a perturbation, we obtain the approximate formula of the amplitude of the slow oscillation as |A| 2 /(|A| 2 + ε 2 ) where A is the effective interlayer interaction and ε is the band split without interlayer interaction. The approximate formula is related to the Thouless number of the dispersion lines.

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“…Subsequent works have shown an occurrence of a unique low-temperature structural transition associated with the dynamical motion of a tetrahedron inside an icosahedral cluster in a series of Cd 6 M APs [3], which is classified into a "nondiffusive order-disorder transition". In addition to the unique structural transitions, the Cd 6 M APs are also found to exhibit long-range magnetic orders [4] at low temperatures unlike ternary magnetic i-QCs and APs where spin-glass-like freezing has been observed without exception. In this talk, we first describe the high-and low-temperature crystalline structure of the Cd 6 Tb AP as a typical example and then discribe its structural and magnetic transitions in detail.…”

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confidence: 98%

Structural and magnetic ordering in Cd-based crystalline approximants

Tamura¹,

Gómez²

2012

Acta Cryst Sect A

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Complex compounds can be found in a large variety of intermetallic systems. They are usually categorised according to the number of atoms per unit cell, which amounts to hundreds or even thousands in some cases [1]. Several quasicrystal approximants and some modulated structures can be found among these compounds, which occur preferably in highly-symmetric lattices. Therefore we are concentrating on cubic [2] and hexagonal structures. In order to better understand complex intermetallics, we describe their structures in different ways, for example in terms of the cluster approach, as superstructures, or as layered compounds. When these compounds are interpreted as cluster packings, two recurring structural motifs are most prominent: multiple-shell fullerene-like clusters packed closely in different ways and blocks of smaller polyhedra (mainly Friauf polyhedra and similar clusters) filling the remaining gaps. Another general property of complex intermetallics is a complex diffraction pattern, which contains a small subset of strong reflections, indicating that the structure can be regarded as a superstructure. The periodicity of the underlying basic structure corresponds also to the number of flat and puckered layers, which can be regarded as building the structure by simple stacking. By comparing geometrically similar but chemically different structures, we hope to reveal the building principles responsible for the formation of highly complex intermetallic structures. In order to do this, we juxtapose the mentioned complementary methods of structure description.

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Conductance of telescoped double-walled nanotubes from perturbation calculations

Cited by 10 publications

References 54 publications

Photo-Response of Functionalized Self-Assembled Graphene Oxide on Zinc Oxide Heterostructure to UV Illumination

Photo-Response of Functionalized Self-Assembled Graphene Oxide on Zinc Oxide Heterostructure to UV Illumination

Relation between dispersion lines and conductance of telescoped armchair double-wall nanotubes analyzed using perturbation formulas and first-principles calculations

Structural and magnetic ordering in Cd-based crystalline approximants

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