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Metallicity in the half-filled Holstein-Hubbard model
H. Fehske, G. Hager, J. Jeckelmann
We re-examine the Peierls insulator to Mott insulator transition scenario in the one-dimensional Holstein-Hubbard model where, at half-filling, electron-phonon and electron-electro…
Parallelization Strategies for Density Matrix Renormalization Group Algorithms on Shared-Memory Systems
G. Hager, E. Jeckelmann, H. Fehske +1
Shared-memory parallelization (SMP) strategies for density matrix renormalization group (DMRG) algorithms enable the treatment of complex systems in solid state physics. We present…
Peierls-insulator Mott-insulator transition in 1D
H. Fehske, G. Wellein, A. Weiße +3
In an attempt to clarify the nature of the crossover from a Peierls band insulator to a Mott Hubbard insulator, we analyze ground-state and spectral properties of the one-dimension…
Magnetic Order-Disorder Transition in the Two-Dimensional Spatially Anisotropic Heisenberg Model at Zero Temperature
D. Ihle, C. Schindelin, A. Weisse +1
The ground-state properties of the spin-1/2 antiferromagnetic Heisenberg model with spatially anisotropic couplings on a square lattice are investigated by a spin-rotation-invarian…
A new model to describe the physics of VOPO
A. Weisse, G. Bouzerar, H. Fehske
In the past different models for the magnetic salt vanadyl pyrophosphate (VOPO) were discussed. Neither a spin ladder nor an alternating chain are capable to describe recently meas…