1,2 Hiroyuki Kanazawa, * Naoki Onishi, * Yuri Mizusawa, * Takahiro Tsunekawa *6,*7 Hitohide Usami * author 1 Technical Computing Solution Unit, Fujitsu Limited, Nakase 1-9-3, Mihama-ku, Chiba-city, Chiba 261-8588, Japan, [email protected] 2 Graduate School of Natural Science & Technology, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan *3 Technical Computing Solut...

We show that the valley Chern number of low energy band in twisted double bilayer graphene can be tuned through two successive topological transitions, where direct bandgap closes, by changing electric field perpendicular to plane layers. The transitions with changes -3 and +1 explained formation three satellite Dirac points around central cone moir\'e Brillouin zone due presence trigonal warpi...

Simulation studies of carbon nanotube field-effect transistors (CNFETs) are presented using models of increasing rigour and versatility that have been systematically developed. Firstly, it is demonstrated how one may compute the standard tight-binding band structure. From this foundation, a self-consistent solution for computing the equilibrium energy band diagram of devices with Schottkybarrie...

The structure and the electronic properties of single-walled zigzag BN and B3C2N3 nanotubes (n, 0; n=4–10) were investigated using first-principles calculations based on a density functional theory. A plane–wave basis set with periodic boundary conditions in conjunction with Vanderbilt ultrasoft pseudo-potential was employed. The energy gap of ZB3C<su...

In this paper, a novel technique for the design of two-channel Quadrature Mirror Filter (QMF) banks with linear phase in frequency domain is presented. To satisfy the exact reconstruction condition of the filter bank, low-pass prototype filter response in pass-band, transition band and stop band is optimized using unconstrained indirect update optimization method. The objective function is form...

the effects of conduction band nonparabolicity, aluminum concentration and external electric field on the charge density and binding energy of an on-center hydrogenic donor impurity in a spherical quantum dot which is located at the center of a cylindrical nano-wire are studied. the energy eigenvalues and the corresponding wave functions are calculated using finite difference approximation with...

We present new Kand L-band imaging of a representative sample of members of the young 3−5Myr old σOrionis cluster. We identified objects with (K − L) excess by analysing colour-colour diagrams and comparing the observations with empirical mainsequence colours. The derived disk frequency depends on the method used: (54±15)% if measured directly from the JHKL colour-colour diagram; or (46±14)% if...

We applied the ab initio approach to evaluate the stability and physical properties of the nanometer-thickness NaCl layered films and found that the rock salt films with a (111) surface become unstable with thickness below 1 nm and spontaneously split to graphitic-like films for reducing the electrostatic energy penalty. The observed sodium chloride graphitic phase displays an uncommon atomic a...

In calculations of the hyperfine splitting in charmonium, the contributions of the disconnected diagrams is considered small and is typically ignored. We aim to estimate nonperturbatively the size of the resulting error, which could potentially affect the high precision calculations of the charmonium spectrum. Following our work on the effects of the disconnected diagrams in unquenched QCD pres...