126 citations · 126 across the 1 of their papers we have counts for
8 papers
Efficient perturbation theory for quantum lattice models
H. Hafermann, G. Li, A. N. Rubtsov +3
We present a novel approach to long-range correlations beyond dynamical mean-field theory through a ladder approximation to dual fermions. The new technique is applied to the two-d…
Exact Results for the Crossover from Gaussian to Non-Gaussian Order Parameter Fluctuations in Quasi One-Dimensional Electronic Systems
Hartmut Monien
The physics of quasi one-dimensional Peierls systems is dominated by order parameter fluctuations. We present an algorithm which allows for the first time to exactly calculate phys…
Strong-Coupling Expansions for Multiparticle Excitations: Continuum and Bound States
S. Trebst, H. Monien, C. J. Hamer +2
We present a new linked cluster expansion for calculating properties of multiparticle excitation spectra to high orders. We use it to obtain the two-particle spectra for systems of…
Strong-coupling perturbation theory for the two-dimensional Bose-Hubbard model in a magnetic field
M. Niemeyer, J. K. Freericks, H. Monien
The Bose-Hubbard model in an external magnetic field is investigated with strong-coupling perturbation theory. The lowest-order secular equation leads to the problem of a charged p…
Dynamics and Thermodynamics of the Bose-Hubbard model
N. Elstner, H. Monien
We report results from a systematic analytic strong-coupling expansion of the Bose-Hubbard model in one and two spatial dimensions. We obtain numerically exact results for the disp…
Phases of the one-dimensional Bose-Hubbard model
Till D. Kuehner, H. Monien
The zero-temperature phase diagram of the one-dimensional Bose-Hubbard model with nearest-neighbor interaction is investigated using the Density-Matrix Renormalization Group. Recen…