45 citations · 135 across the 11 of their papers we have counts for
11 papers
Effect of Substitutional Impurities on the Electronic States and Conductivity of Crystals with Half-filled Band
E. P. Nakhmedov, H. Feldmann, R. Oppermann +1
Low temperature quantum corrections to the density of states (DOS) and the conductivity are examined for a two-dimensional(2D) square crystal with substitutional impurities. By sum…
Distribution function of the local density of states of a one-channel weakly disordered ring in an external magnetic field
H. Feldmann, E. P. Nakhmedov, R. Oppermann
A real space diagrammatic method, which is an extension of the Berezinskii technique to problems with periodic boundary condition, is formulated to study the density of states (DOS…
Selforganized 3-band structure of the doped fermionic Ising spin glass
H. Feldmann, R. Oppermann
The fermionic Ising spin glass is analyzed for arbitrary filling and for all temperatures. A selforganized 3-band structure of the model is obtained in the magnetically ordered pha…
Pseudogaps and Charge Band in the Parisi Solution of Insulating and Superconducting Electronic Spin Glasses at Arbitrary Fillings
R. Oppermann, H. Feldmann
We report progress in understanding the fermionic Ising spin glass with arbitrary filling. A crossover from a magnetically disordered single band phase via two intermediate bands j…
Replica symmetry breaking solution for the fermionic Ising spin glass and the Ghatak-Sherrington model
H. Feldmann, R. Oppermann
We solve the fermionic version of the Ising spin glass for arbitrary filling μand temperature T taking into account replica symmetry breaking. Using a simple exact mapping from μto…
Aharonov-Bohm effect in one-channel weakly disordered rings
E. P. Nakhmedov, H. Feldmann, R. Oppermann
A new diagrammatic method, which is a reformulation of Berezinskii's technique, is constructed to study the density of electronic states of a one-channel weakly disordered…