Abstract
We have investigated a non-linearity of quantum point contacts (QPCs) by measuring their differential resistance, dV dI , and the rectification, i.e. a dc voltage response V rect to an applied ac curent. The differential resistance has an almost step-like behavior, i.e. the resistance is constant in a wide range of small currents but depends on current direction. The value of the step is of the order of a few tens of Ohms against a background of several kΩ and the step occurs over a very small bias less than kT e . This current asymmetry causes an almost linear dependence of the rectified voltage on applied ac current amplitude. The step height varies strongly with gate-voltage and is to some extent correlated with the quantized conductance plateaus.
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