A two-band k·p model for the conduction band of silicon is proposed and compared with other band structure models, notably the nonlocal empirical pseudo-potential method and the spds nearest-neighbor tight-binding model. The twoband k·p model is demonstrated to predict results consistent with the empirical pseudo-potential method, and to accurately describe the band structure around the valley ...

Submitted for the MAR14 Meeting of The American Physical Society Anomalous Josephson effect in semiconductor nanowire with strong spin-orbit interaction and Zeeman effect TOMOHIRO YOKOYAMA, Center for Emergent Matter Science (CEMS), RIKEN Institute, MIKIO ETO, Faculty of Science and Technology, Keio University, YULI NAZAROV, Kavli Institute of Nanoscience, Delft University of Technology — We th...

A genetic algorithm procedure is developed and implemented for fitting parameters for many-body inter-atomic force field functions for simulating nanotechnology atomistic applications using portable Java on cycle-scavenged heterogeneous workstations. Given a physics based analytic functional form for the force field, correlated parameters in a multi-dimensional environment are typically chosen ...

We have compared the recently introduced generalized simulated annealing ~GSA! with conventional simulated annealing ~CSA!. GSA was tested as a tool to obtain the ground-state geometry of molecules. We have used selected silicon clusters (Sin , n54 – 7,10) as test cases. Total energies were calculated through tightbinding molecular dynamics. We have found that the replacement of Boltzmann stati...

2014 The density of states of yttrium compounds YM2 (M = Fe, Co, Ni) is calculated within a tightbinding scheme. Using the Stoner model, conclusions are drawn about their magnetic and electronic properties. In YCo2, we show that one has to introduce paramagnon effects in order to explain the electronic properties. The additional d-f interaction introduced by rare-earth atoms (R) in RM2 is treat...

We study Andreev reflection in graphene nanoribbon/superconductor hybrid junctions. By using a tightbinding approach and the scattering formalism we show that finite-size effects lead to notable differences with respect to the bulk-graphene case. At subgap voltages, conservation of pseudoparity, a quantum number characterizing the ribbon states, yields either a suppression of Andreev reflection...