Showing papers on "Quantum capacitance published in 1994"

Realization and maintenance of the unit of capacitance with the PTB cross capacitor during the last ten years

Abstract: A precise realization of the unit of capacitance is important for the determination of both the Josephson and the von Klitzing constants. The main design criteria of the PTB's cross capacitor, the maintenance of the unit of capacitance over the last 10 years, and a special capacitance-measuring bridge for tracing back the electrode capacitance in the absolute volt experiment to SI units are described in this paper. >

Giant capacitance oscillations related to the quantum capacitance in GaAs/AlAs superlattices

Abstract: We have observed periodic current and capacitance oscillations with increasing bias on doped GaAs/AlAs superlattices at a temperature of 77 K. The maximum of the observed capacitance is larger than usual geometric capacitances in superlattices, being comparable to the quantum capacitance of the two‐dimensional (2D) electron system proposed by Luryi. A model based on well‐to‐well sequential resonant tunneling due to the movement of the boundary between the electric field domains in superlattice was proposed to explain the origin of the giant capacitance oscillations. It was demonstrated that the capacitance at the peaks of capacitance‐voltage (C‐V) characteristics reflects the quantum capacitance of the space‐charge region at the boundary between the domains (a novel 2D electron system).