Contact effect in the dynamic electron transport of a two-probe mesoscopic conductor

摘要

Based on the self-consistent electron dynamic transport theory for multi-probe mesoscopic systems,we calculate the distribution of internal potential,charge density,and ac conductance of a two-probe mesoscopic conductor with wide trapezoid reservoirs,and study the contact effect.The results show that including the contact effect can make a significant difference to the frequency-dependent electron transport properties.In the nonzero frequency case,the internal potential and the charge density are complex with extremely small imaginary parts.Importantly,the imaginary part of the charge density gives rise to a real ac conductance (admittance),which corresponds to the charge-relaxation resistance.