Quantization of the Hall conductivity well beyond the adiabatic limit in pulsed magnetic fields

Abstract

We measure the Hall conductivity, ${\sigma }_{xy}$, on a Corbino geometry sample of a high-mobility AlGaAs/GaAs heterostructure in a pulsed magnetic field. At a bath temperature about 80 mK, we observe well expressed plateaux in ${\sigma }_{xy}$ at integer filling factors. In the pulsed magnetic field, the Laughlin condition of the phase coherence of the electron wave functions is strongly violated and, hence, is not crucial for ${\sigma }_{xy}$ quantization.

4 pages, 4 figures, submitted to PRL