99 citations · 324 across the 15 of their papers we have counts for
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Constraint Quantization of Slave-Particle Theories
Christian Helm, Joachim Keller
We start from the Barnes-Coleman slave-particle description, where the Hubbard operators are decomposed into a product of fermionic () and bosonic () operators. The qua…
Effects of spin fluctuations in the t-J model
T. Obermeier, T. Pruschke, J. Keller
Recent experiments on the Fermi surface and the electronic structure of the cuprate-supercondutors showed the importance of short range antiferromagnetic correlations for the physi…
Dynamical Magnetic Susceptibility for the - Model
Th. Pruschke, Th. Obermeier, J. Keller
We present results for the {\em dynamical}\/ magnetic susceptibility of the - model, calculated with the dynamical mean field theory. For we find enhanced ferromagnetic…
Collective Spin Modes in Superconducting Double Layers
Christian Helm, Franz Forsthofer, Joachim Keller
We investigate a double layer system with tight-binding hopping, intra-layer and inter-layer interactions, as well as a Josephson like coupling. We find that an antiferromagnetic s…