Hall magnetocapacitance in two-dimensional electron systems

A. M. C. Valkering, P. K. H. Sommerfeld, R. A. M. van de Ven, R. W. van der Heijden, F. A. P. Blom, M. J. Lea, F. M. Peeters

Published 1998-10-28Version 1

The magnetocapacitance of a two-dimensional electron system (2DES) is investigated experimentally, both under and away from Quantum Hall (QH) conditions, at frequencies between 1 kHz and 100 MHz. The nature of the capacitive signal in a bounded 2DES is determined by a resistive cut-off frequency 1/$\tau \propto \sigma_{xx}$, the longitudinal magnetoconductivity. A new response mechanism is reported for angular frequencies $\omega > 1/\tau$, which is controlled by the $\em transverse$ or Hall conductivity $\sigma_{xy}$ and the boundaries of the sample, even at frequencies far below those of the Edge Magnetoplasma resonances and away from the QH-conditions.