Electronic phase diagrams of carriers in self-assembled quantum dots: violation of Hund's rule and the Aufbau principle for holes

We study the ground-state orbital and spin configurations of up to six electrons or holes loaded into self-assembled quantum dots. We use a general phase-diagram approach constructed from single-particle pseudopotential and many-particle configuration interaction methods. The predicted hole charging energies agree with recent charging experiments, but offer a different interpretation: we find that while the charging of electrons follows both Hund's rule and the Aufbau principle, the charging of holes follows a nontrivial charging pattern which violates both the Aufbau principle and Hund's rule.     

Test of a sum rule for the nucleon magnetic moments

It is shown that the original version of the sum rule relating the isovector part of the nucleon magnetic moment to aπ N scattering amplitude is not consistent with the experimental data. However there is good agreement for the corrected version ofMaiani andPreparata.     

Systematics of final state screening in 5d metals

The experimental systematics of the Auger parameter, ε, in the 3d metal series have been well described in terms of a quasi-atomic model of screening. Whether these results are transferrable from a narrow to a wide d-band series has been moot. We present, for the first time, measurements of ε in the 5d series, manifesting systematics similar to those in the 3d series. Model calculations support the validity of the qam.     

The contribution of 5d electrons to the saturation magnetic moments and magnetic hyperfine fields in the heavy rare earth metals

The main results of a model for 5d electrons in the heavy rare earth metals are presented. The model involves the use of wave functions based on published analyses for 4fⁿ5d6s² atomic configurations, and the spreading of each of these energy levels uniformly over a band of width W in the metals. Excess saturation magnetic moments above those of the tripositive ions can be explained by the model with W in the range 0.84±0.16eV in the five metals Gd, Tb, Dy, Er and Tm. The magnetic hyperfine fields in the metals include negative contributions from the 5d electrons which have been shown to amount to about ?250koe in Gd, Er and Tm.     

Systematics of the competition between pn and d emission in heavy-ion induced nuclear reactions

The competition between pn and d evaporation leading to production of the same residual nuclei has been measured for 9 heavy-ion induced nuclear reactions, each at several bombarding energies, for target-projectile combinations resulting in compound nuclei 19 ? A ? 71. An association of the ratio σ_pn/σ_d with the maximum excitation energy available to the residual nucleus demonstrates a systematic trend, the significance and potential applications of which are investigated.