Zobrazeno 1 - 10
of 21
pro vyhledávání: '"Nakanishi A"'
Publikováno v:
Journal of the Physical Society of Japan. 89(3):034708
First-principles investigations combined with the nonequilibrium Green's function method are conducted to understand the spin-polarized transport property in graphene (Gr) based magnetic tunnel junctions (MTJs). Our systematic and comparative investi
Publikováno v:
Journal of the Physical Society of Japan. 77:109-112
Following the general rule on the negative effective U system, we have derived a microscopic mechanism of effective negative interaction from the first principles. The charge-excitation induced negative effective U is exemplified by s 1 electronic co
Autor:
Tsuneya Ando, Takeshi Nakanishi
Publikováno v:
Journal of the Physical Society of Japan. 74:3027-3034
The Boltzmann conductivity is calculated for carbon nanotubes in the presence of an Aharonov–Bohm magnetic flux. Effects of impurity scattering are considered at low temperatures and those of elect...
Autor:
Md. Mahmudur Rahman, Tomoya Kishi, Hideaki Kasai, Masanori Kisaku, Tanglaw Roman, Hiroshi Nakanishi, Wilson Agerico Diño
Publikováno v:
Journal of the Physical Society of Japan. 74:742-745
We investigate the electric and magnetic properties of a (3,3) single-walled carbon nanotube filled with a linear Co nanowire. We carry out first-principle calculations based on the spin-polarized density functional theory, and find that in the stabl
Autor:
Tsuneya Ando, Takeshi Nakanishi
Publikováno v:
Journal of the Physical Society of Japan. 70:1647-1658
The effective Hamiltonian for two crossed nanotubes is derived in a k · p scheme and the conductance between them is calculated in the Born approximation. The conductance is found to depend strongly on the crossing angle with large maxima at commens
Publikováno v:
Journal of the Physical Society of Japan. 70:481-491
An effective-mass theory is developed on transport of non-doped carbon nanotubes with local and short-range impurities in the presence of a magnetic field. The conductance is shown to be scaled com...
Publikováno v:
Scopus-Elsevier
The conductance is calculated for approximately 1.6×10 5 armchair carbon nanotubes (CN's) with a different lattice vacancy in a tight-binding model using a multi-channel Landauer's formula. When th...
Publikováno v:
Scopus-Elsevier
The conductance of carbon nanotubes with a vacancy is studied in a tight-binding model. We examine the Fermi energy e dependence of the conductance and show it is quantized into zero, one, and two times the conductance quantum \(e^{2}/\pi\hbar\) depe
Autor:
Tsuneya Ando, Takeshi Nakanishi
Publikováno v:
Journal of the Physical Society of Japan. 68:561-566
The transmission and reflection coefficients of a carbon nanotube with a scatterer are calculated in a tight-binding model. The result obtained in a k · p scheme is shown to be essentially valid, including the complete absence of back scattering for
Autor:
Takuya Fujino, Fumitake Kikuchi, Peijie Sun, Hideyuki Sato, Hitoshi Sugawara, Yoshiki Nakanishi, Mitsuteru Nakamura, Masahito Yoshizawa, Daisuke Kikuchi, Gendo Ohmi, Masashi Ohashi
Publikováno v:
Journal of the Physical Society of Japan. 77:216-218
Elastic property of the filled skutterudite compound PrFe 4 P 12 was investigated under hydrostatic pressures by means of ultrasonic measurements for the first time. PrFe 4 P 12 undergoes a mysterious phase transition at 6.5 K, which origin is still