Conductance fluctuations in nanostructures of doped CdTe and Cd 1 − xMn xTe epilayers

Abstract

Weak-field magnetoresistance and universal conductance fluctuations have been studied at millikelvin temperatures in submicron wires of In-doped n +-CdTe and n +-Cd 0.99Mn 0.01Te. The fluctuations contain a periodic component of unknown origin. The giant spin-splitting of the electron states, caused by the s-d exchange interaction with the Mn spins, results in the positive magnetoresistance and the temperature dependence of the fluctuation pattern.