Enhancement of quantum dot peak-spacing fluctuations in the fractional quantum Hall regime
Department of Physics, Ben-Gurion University - Beer Sheva 84105, Israel
Accepted: 26 October 1998
The fluctuations in the spacing of the tunneling resonances through a quantum dot have been studied in the quantum Hall regime. Using the fact that the ground state of the system is described very well by the Laughlin wave function, we were able to determine accurately, via classical Monte Carlo calculations, the amplitude and distribution of the peak-spacing fluctuations. Our results clearly demonstrate a big enhancement of the fluctuations as the importance of the electronic correlations increases, namely as the density decreases and filling factor becomes smaller. We also find that the distribution of the fluctuations approaches a Gaussian with increasing density of random potentials.
PACS: 73.61.-r – Electrical properties of specific thin films and layer structures (multilayers, superlattices, quantum wells, wires, and dots) / 73.40.Hm – Quantum Hall effect (integer and fractional) / 74.40.+k – Fluctuations (noise chaos, nonequilibrium superconductivity, localization, etc.)
© EDP Sciences, 1998