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Quantum ballistic transport in constrictions of<i>n</i>-PbTe
Conductance of submicron constrictions of PbTe:Bi was studied up to 8 T and between 4.2 K and 50 mK. The structures were fabricated by electron beam lithography and chemical etching of high-electron mobility films grown by molecular beam epitaxy on ${\mathrm{BaF}}_{2}.$ In the moderately strong magnetic fields perpendicular to the …