Abstract
Conductance quantization was measured in submicron mesa constrictions, patterned into PbTe/Pb 0.92Eu 0.08Te quantum wells of thickness 12, 25 and 50 nm. The main observation is almost unitary transmission of the one-dimensional quantum modes, despite of significant amount of charged defects in the vicinity of the constrictions. Such an extraordinary result is a consequence of the paraelectric properties of PbTe, namely, the suppression of long-range tails of Coulomb potentials due to the huge dielectric constant.
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