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VOLUME 48 (1988) | ISSUE 10 | PAGE 546
Nonlinear quantum conductance of a point contact
An increase in the extraction voltage Vis shown to round the quantum steps in a plot of the current through a point contact [B.J. van Wees et al., Phys. Rev. Lett. 60,848 (1988); D. A. Wharam etal9 J. Phys. C. 21, L209 (1988) ] versus the diameter of the constriction. The number of steps on this plot becomes bounded: η < 2Ер/е V. Additional steps, equal to half-integer values of the quantum e2/2nh, appear in the differential conductance.