Recent theory [Phys. Rev. Lett. 96, 066102 (2006)] and experiment [Phys. Rev. Lett. 99, 026102 (2007)] show that (0001) ultrathin films of wurtzite (WZ) materials surprisingly transform into a stable graphitelike structure, but the stability is limited to thicknesses of only a few atomic layers. Using first-principles calculations of both freestanding and substrate-supported thin films, we pred...

Wurtzite-type aluminum scandium nitride [WZ-(Al1−xScx)N] thin films were grown on 0.5 wt % Nb-doped SrTiO3(111) (Nb:STO) single crystal substrates using the radio frequency reactive magnetron sputtering method with Al and Sc targets. WZ-(Al1−xScx)N 0 ≤ x 0.49 epitaxially Nb:STO substrates. Films 0.3 exhibited multi-domain in-plane orientation. The coexistence of two rotation domains, (Al,Sc)N[1...

Direct measurements of the trilinear gauge boson couplings by the CDF and DØ collaborations at Fermilab are reviewed. Limits on the anomalous couplings were obtained at a 95% CL from four diboson production processes: Wγ production with the subsequent W boson decay to eν or μν, WW production with both the W boson decaying to eν or μν, WW/WZ production with one of the gauge bosons decaying lepto...

Abstract In the paper we present a vectorized algorithm for WZ factorization of a matrix which was implemented with the BLAS1 library. We present the results of numerical experiments which show that vectorization accelerates the sequential WZ factorization. Next, we parallelized both algorithms for a two-processor shared memory machine using the OpenMP standard. We present performances of these...

Abstract The wurtzite (wz) structure of CdS is analysed using density functional theory within the generalized gradient approximation (GGA) and Hubbard correction (GGA+U). total energy convergence evaluation carried out concerning cut-off (ecutwfc) k-point sampling. geometry optimization wz-CdS calculated force minimization process, which based on Broyden-Fletcher-Goldfarb-Shanno (BFGS) algorit...

Young's modulus of tapered mixed composition (zinc-blende with a high density twins and wurtzite stacking faults) gallium phosphide (GaP) nanowires (NWs) was investigated by atomic force microscopy. Experimental measurements were performed obtaining bending profiles as-grown inclined GaP NWs deformed applying constant to series NW surface locations at various distances from the NW/substrate int...