Alfred Z. Msezane

Universal Behavior of Two-Dimensional 3He at Low Temperatures

On the example of two-dimensional (2D) 3He we demonstrate that the main universal features of its experimental temperature T-density x phase diagram [see Neumann, Nyéki, and Saunders, Science 317, 1356 (2007)10.1126/science.1143607] look like those in the heavy-fermion metals. Our comprehensive theoretical analysis of the experimental situation in 2D 3He allows us to propose a simple expression for the effective mass M*(T,x), describing all the diverse experimental facts in 2D 3He in a unified manner and demonstrating that the universal behavior of M*(T,x) coincides with that observed in heavy-fermion metals.

COMPTON SCATTERING CROSS SECTIONS FOR HEAVY ATOMS WITH ACCOUNT OF MANY-ELECTRON CORRELATIONS

Compton ionization of krypton and xenon outer and intermediate subshells is investigated. Results are presented covering the energy transferred to the atoms from their ionization thresholds up to 30 Ry and momentum transferred up to 4 a.u. Calculations are performed in the one-electron Hartree–Fock approximation and with many-electron effects taken into account in the random phase approximation with exchange. It is demonstrated that many-electron correlations play an important role not only in dipole but also in monopole and quadrupole transitions, significantly modifying the cross sections as well as leading to new maxima and minima.

Comment on "Zeeman-driven Lifshitz transition: a model for the experimentally observed Fermi-surface reconstruction in YbRh2Si2".

Comment on Zeeman-Driven Lifshitz Transition: A Model for the Experimentally Observed Fermi-Surface Reconstruction in YbRh2Si2 by A. Hackl and M. Vojta, Phys. Rev. Lett. 106, 137002 (2011).

Spectral and electron collision properties of atomic ions

The aim of this study is to delineate the systematics of various properties of positive atomic ions over a wide range of nuclear charge, Z, and electron number, N. These properties include energy levels, transition rates, electron collision cross sections, and other directly observable quantities.