Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-06-29
Phys. Rev. B 72, 125332 (2005)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
7 pages, 6 figures, submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.72.125332
Conductance quantization was measured in submicron constrictions of PbTe, patterned into narrow,12 nm wide quantum wells deposited between Pb$_{0.92}$Eu$_{0.08}$Te barriers. Because the quantum confinement imposed by the barriers is much stronger than the lateral one, the one-dimensional electron energy level structure is very similar to that usually met in constrictions of AlGaAs/GaAs heterostructures. However, in contrast to any other system studied so far, we observe precise conductance quantization in $2e^2/h$ units, {\it despite of significant amount of charged defects in the vicinity of the constriction}. We show that such extraordinary results is a consequence of the paraelectric properties of PbTe, namely, the suppression of long-range tails of the Coulomb potentials due to the huge dielectric constant.
Aleszkiewicz M.
Bauer Gerry
Dietl Tomasz
Grabecki G.
Janik E.
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