92 citations · 123 across the 2 of their papers we have counts for
20 papers
A BCS-BEC crossover in the extended Falicov-Kimball model: Variational cluster approach
K. Seki, R. Eder, Y. Ohta
We study the spontaneous symmetry breaking of the excitonic insulator state induced by the Coulomb interaction in the two-dimensional extended Falicov-Kimball model. Using the…
Mott transition and ferrimagnetism in the Hubbard model on the anisotropic kagomé lattice
A. Yamada, K. Seki, R. Eder +1
Mott transition and ferrimagnetism are studied in the Hubbard model on the anisotropic kagomé lattice using the variational cluster approximation and the phase diagram at zero temp…
Stripes in Doped Antiferromagnets: Single-Particle Spectral Weight
Marc G. Zacher, Robert Eder, Enrico Arrigoni +1
Recent photoemission (ARPES) experiments on cuprate superconductors provide important guidelines for a theory of electronic excitations in the stripe phase. Using a cluster perturb…
Strong coupling theory for the Hubbard model
A. Dorneich, M. G. Zacher, C. Groeber +1
We reanalyze the Hubbard-I approximation by showing that it is equivalent to an effective Hamiltonian describing Fermionic charge fluctuations, which can be solved by Bogoliubov tr…
Excitation spectrum of the S=1/2 quantum spin ladder with frustration: elementary quasiparticles and many-particle bound states
V. N. Kotov, O. P. Sushkov, R. Eder
We study the excitation spectrum of the two-chain S=1/2 Heisenberg spin ladder with additional inter-chain second-neighbor frustrating interactions. The one and two-particle excita…
Dynamics of an SO(5) symmetric ladder model
R. Eder, A. Dorneich, M. G. Zacher +2
We discuss properties of an exactly SO(5) symmetric ladder model. In the strong coupling limit we demonstrate how the SO(3)-symmetric description of spin ladders in terms of bond B…