Changing the electronic spectrum of a quantum dot by adding electrons

The temperature dependence of Coulomb blockade peak height correlation is u sed to investigate how adding electrons to a quantum dot alters or "scrambl es" its electronic spectrum. Deviations from finite-temperature random matr ix theory with an unchanging spectrum indicate spectral scrambling after a small number of electrons are added. Enhanced peak-to-peak correlations at low temperature are observed. Peak height statistics show similar behavior in several dot configurations despite significant differences in correlatio ns.