Takeshi Nakanishi

TL;DR: This work demonstrates logic circuits with field-effect transistors based on single carbon nanotubes that exhibit a range of digital logic operations, such as an inverter, a logic NOR, a static random-access memory cell, and an ac ring oscillator.

TL;DR: The absence of back scattering in carbon nanotubes is attributed to Berry's phase which corresponds to a sign change of the wave function under a spin rotation of a neutrino-like particle in a two-dimensional graphite as mentioned in this paper.

TL;DR: In this paper, the effective potential of an impurity in a k · p scheme is derived in two-dimensional graphite sheet, and the crossover between these two regimes occurs around the range smaller than the lattice constant.

TL;DR: This review investigates nanoscale effects on the physical properties of graphene nanoribbons and clarify the role of edge boundaries, and provides analytical solutions for electronic dispersion and the corresponding wavefunction in graphene nan oribbons with their detailed derivation using wave mechanics based on the tight-binding model.

TL;DR: The possibility of superconductivity in the ground state of the 2D Hubbard model was investigated by means of the variational Monte Carlo method in this article, where the energy gain of the d-wave SC state, obtained as the difference of the minimum energy with a finite gap and that with zero gap, was examined with respect to dependences on U, electron density ρ and next nearest neighbor transfer t′ mainly on the 10×10 lattice.