材料期刊网

The transverse Stark effect in a rectangular quantum wire is investigated in the presence of an electric field by means of the variational calculation method and effective-mass approximation. We obtain the asymptotic expansions of the Stark shift for low electric fields and for strong electric fields respectively, and find that the Stark shift is a quadratic function of the electric field for low electric fields and is an approximate linear function of the electric field for strong electric fields. The Stark shift and the polarization effect of electron and hole are influenced intensively by the cross-sectional shape of quantum wires and direction of the electric field. (C) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.