711 citations · 5.5k across the 188 of their papers we have counts for
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Spectral Densities from Dynamic Density-Matrix Renormalization
Carsten Raas, Götz S. Uhrig
Dynamic density-matrix renormalization provides valuable numerical information on dynamic correlations by computing convolutions of the corresponding spectral densities. Here we di…
Thermodynamics of a Spin-1/2 Chain Coupled to Einstein Phonons
Alexander Bühler, Götz S. Uhrig, Jaan Oitmaa
A high order series expansion is employed to study the thermodynamical properties of a S=1/2 chain coupled to dispersionless phonons. The results are obtained without truncating th…
Magnetic excitations in the stripe phase of high-T_c superconductors
G. S. Uhrig, K. P. Schmidt, M. Grüninger
The magnetic excitations in the stripe phase of high-T_c superconductors are investigated in a model of spin ladders which are effectively coupled via charged stripes. Starting fro…
The Quartic Oscillator: a Non-Perturbative Study by Continuous Unitary Transformations
S. Dusuel, Goetz S. Uhrig
The quantum quartic oscillator is investigated in order to test the many-body technique of the continuous unitary transformations. The quartic oscillator is sufficiently simple to…
Unifying Magnons and Triplons in Stripe-Ordered Cuprate Superconductors
G. S. Uhrig, K. P. Schmidt, M. Grüninger
Based on a two-dimensional model of coupled two-leg spin ladders, we derive a unified picture of recent neutron scattering data of stripe-ordered La_(15/8)Ba_(1/8)CuO_4, namely of…
High Order Perturbation Theory for Spectral Densities of Multi-Particle Excitations: S=1/2 Two-Leg Heisenberg Ladder
Christian Knetter, Kai P. Schmidt, Götz S. Uhrig
We present a high order perturbation approach to quantitatively calculate spectral densities in three distinct steps starting from the model Hamiltonian and the observables of inte…