Before revision: The conductance shows plateaus at multiples of .A quantum point contact (QPC) is a narrow constriction between two wide electrically conducting regions, of a width comparable to the electronic wavelength (nano- to micrometer).
After revision: (mistakenly labeled as in the figure)The conductance shows plateaus at multiples of .A quantum point contact (QPC) is a narrow constriction between two wide electrically conducting regions, of a width comparable to the electronic wavelength (nano- to micrometer).