We have applied the self-consistent local pseudopotential method to study the electronic structure of Si, Ge and e&. The calculated band structures and valence charge densities agree well with experiment. The momentum-space formalism of Ihm, Zunger and Cohen, based on the self-consistent local pseudopotential method, is used to calculate the total energy of these crystals. The results are in good agreement with experiment.

Peltier heating effects have been observed to cause significant errors in measurements of electrical resistivity in chromium. These effects occur in many experimental arrangements, and for both AC and DC techniques. The errors became particularly acute in the vicinity of the Nee1 transition.

We study an adiabatic quantum pump effect in a two terminal graphene device with two oscillating square electric barriers and a stationary magnetic barrier using the scattering matrix approach. The model employs the low-energy Dirac approximation and incorporates the possible existence of a finite band gap in graphene spectrum. We show that in this case valley-polarized and pure valley currents can be pumped due to the valley symmetry breaking. For a δ-function magnetic barrier we present analytical expressions for bilinear total and valley pumping responses. These results are compared to numerical ones for a double δ-function, a square and a triple square magnetic barriers.

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