5 papers
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…
Metal-Insulator Transition in Randomly Interacting Systems
B. Rosenow, R. Oppermann
We discuss a metal-insulator transition caused by random couplings of magnetic moments in itinerant systems. An analytic solution for the single particle Green function is derived…
Competition between spin glass order and strong coupling superconductivity in a single-species fermion model
H. Feldmann, R. Oppermann
The phase diagram of a single species fermion model allowing for local pairing superconductivity (SC) and spin glass order (SG) is derived as a function of chemical potential μand…
Fermionic TAP-equations
Martin Rehker, Reinhold Oppermann
We derive the TAP equations for the fermionic Ising spin glass. It is found that, just as in the non-fermionic model, the conditions for stability and for validity of the free ener…
Studies of the phase diagram of randomly interacting fermionic systems
R. Oppermann, B. Rosenow
We present details of the phase diagrams of fermionic systems with random and frustrated interactions, emphasizing the important role of the chemical potential. The insulating ferm…