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Using the bosonization technique, a theory for the collective excitations of the interacting electrons in quantum wires with two subbands occupied is developed. The dispersion relations for the inter-subband charge and spin density excitations are determined. The results are used to interpret...
The results of our recent evaluation of the critical exponents of the localization length, v and the conductivity, s, at the Anderson transition for box and Gaussian distributions of the random potential are reported. Data are evaluated not only in the centre of the band but also near the band...