Hall magnetocapacitance in two-dimensional electron systems

Details Hall magnetocapacitance in two-dimensional electron systems Hall magnetocapacitance in two-dimensional electron systems

1998-10-28

arxiv.org/abs/cond-mat/9810377v1

Phys. Rev Lett. 81, 5398 (1998)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Experimental paper, 4 figures

Scientific paper

10.1103/PhysRevLett.81.5398

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.

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