7 research outputs found
Effect of intersubband scattering on weak localization in 2D systems
The theory of weak localization is generalized for multilevel 2D systems
taking into account intersubband scattering. It is shown that weak intersubband
scattering which is negligible in a classical transport, affects strongly the
weak-localization correction to conductivity. The anomalous magnetoresistance
is calculated in the whole range of classically low magnetic fields. This
correction to conductivity is shown to depend strongly on the ratios of
occupied level concentrations. It is demonstrated that at relatively low
population of the excited subband, it is necessary to use the present theory
because the high-field limit asimptotics is shown to be achieved only in
classical magnetic fields.Comment: 18 pages, 4 figures. Accepted to Phys. Rev. B 6
Weak localization and electron-electron interactions in Indium-doped ZnO nanowires
Single crystal ZnO nanowires doped with indium are synthesized via the
laser-assisted chemical vapor deposition method. The conductivity of the
nanowires is measured at low temperatures in magnetic fields both perpendicular
and parallel to the wire axes. A quantitative fit of our data is obtained,
consistent with the theory of a quasi-one-dimensional metallic system with
quantum corrections due to weak localization and electron-electron
interactions. The anisotropy of the magneto-conductivity agrees with theory.
The two quantum corrections are of approximately equal magnitude with
respective temperature dependences of T^-1/3 and T^-1/2. The alternative model
of quasi-two-dimensional surface conductivity is excluded by the absence of
oscillations in the magneto-conductivity in parallel magnetic fields.Comment: 13 pages, Corrected forma