Localized electronic states near dislocations in transition metals

Strain induced deep electronic states around threading dislocations in GaN.

Combining through-focus high-resolution transmission electron microscopy and hierarchical multiscale simulations consisting of density-functional theory, analytical empirical potentials, and continuum elastic theory we demonstrate the existence of a new dislocation type in GaN. In contrast with all previously identified or suggested dislocation structures in GaN, all core atoms are fully coordi...

Quasiparticles near quantum phase transition in heavy fermion metals

We have shown that the Landau paradigm based upon both the quasiparticle concept and the notion of the order parameter can be used to explain the anomalous behavior of heavy fermion metals. Exploiting this paradigm and the fermion condensation quantum phase transition (FCQPT) we show that this anomalous behavior is universal and can be used to capture the essential aspects of recent experiments...

Character of the Electronic States Near The Metal-Insulator Transition In Gallium Manganese Arsenide

The character of electronic states near the Mott-Anderson metal-insulator transition in the ferromagnetic semiconductor Ga1-xMnxAs is studied by cross sectional scanning tunneling microscopy. 200nm thick samples grown by MBE at UCSB with doping levels from 1.5%, close the metal-insulator transition, to 5%, deep into the metallic regime, were studied at 4.2K. The thickness of the samples ensured...

Character of the Electronic States near the Metal- Insulator Transition in Gallium Manganese Arsenide

Electronic Correlations Near a Peierls-CDW Transition

Results of a phenomenological Monte Carlo calculation for a 2D electronphonon Holstein model near a Peierls-CDW transition are presented. Here the zero Matsubara frequency part of the phonon action is dominant and we approximated it by a phenomenological form that has an Ising-like PeierlsCDW transition. The resulting model is studied on a 32×32 lattice. The single particle spectral weight A(k,...