activity
19962004
most citedCoupling between phonons and intrinsic Josephson oscillations in cuprate superconductors

65 citations · 391 across the 24 of their papers we have counts for

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cond-mat1996

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…

cond-mat1996

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…