15 citations · 67 across the 12 of their papers we have counts for
12 papers
Nonanalytic quantum oscillator image of complete replica symmetry breaking
Reinhold Oppermann, Hannes Schenck
We describe the effect of replica symmetry breaking in the field distribution function P(h) of the T=0 SK-model as the difference between a split Gaussian and the first excited sta…
Spin-orbit interactions mediated negative differential resistance in a quasi-two-dimensional electron gas with finite thickness
E. Nakhmedov, O. Alekperov, R. Oppermann
Effects of the spin-orbit interactions on the energy spectrum, Fermi surface and spin dynamics are studied in structural- and bulk-inversion asymmetric quasi-two-dimensional struct…
Dynamical CPA approach to an itinerant fermionic spin glass model
M. Bechmann, R. Oppermann
We study a fermionic version of the Sherrington-Kirkpatrick model including nearest-neighbor hopping on a -dimensional simple cubic lattices. The problem is reduced to one…
Modulated replica symmetry breaking schemes for antiferromagnetic spin glasses
R. Oppermann, D. Sherrington, M. Kiselev
We define modulated replica symmetry breaking (RSB)-schemes which combine tree- and wave-like structures. A modulated scheme and unmodulated RSB are applied at 1-step level to a se…
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…
Spin - glass transition in Kondo lattice with quenched disorder
M. N. Kiselev, R. Oppermann
We use the Popov-Fedotov representation of spin operators to construct an effective action for a Kondo lattice model with quenched disorder at finite temperatures. We study the com…
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…
Parisi-Symmetry of the Many-Body Quantum Theory of randomly interacting fermionic systems
R. Oppermann, B. Rosenow
We show that fermion systems with random interactions lead to strong coupling of glassy order and fermionic correlations, which culminates in the implementation of Parisi replica p…
Magnetic Gaps related to Spin Glass Order in Fermionic Systems
R. Oppermann, B. Rosenow
We provide evidence for spin glass related magnetic gaps in the fermionic density of states below the freezing temperature. Model calculations are presented and proposed to be rele…
Fermionic Quantum Spin Glass Transitions
R. Oppermann, B. Rosenow
This article reviews recent progress of the analytical theory of quantum spin glasses (QSG). Exact results for infinite range and one loop renormalisation group calculations for fi…
Tricritical behaviour of Ising spin glasses with charge fluctuations
B. Rosenow, R. Oppermann
We show that tricritical points displaying unusal behaviour exist in phase diagrams of fermionic Ising spin glasses as the chemical potential or the filling assumes characteristic…