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cond-mat.str-el1998
Paramagnetic metal-insulator transition in the 2D Hubbard model
C. Groeber, M. G. Zacher, R. Eder
We study the transition from paramagnetic metal to paramagnetic insulator by finite temperature Quantum Monte-Carlo simulations for the 2D Hubbard model at half-filling. Working at…
cond-mat1998
Theory of magnetic excitations in the Kondo lattice
R. Eder
We present a theory for the spin excitations of the Kondo lattice. We derive an effective Hamiltonian, which describes Fermionic spin 1/2 charge fluctuations interacting with Boson…
cond-mat.str-el1998
Energy of the nearest neighbor RVB state by systematic loop expansion
Robert Eder
We present an approximation scheme for the calculation of the norm and energy of the nearest-neighbor-RVB state for the Heisenberg antiferromagnet on the 2D square lattice. The app…