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6 papers · 2 filters
Edge singularities in high-energy spectra of gapped one-dimensional magnets in strong magnetic fields
A. Friedrich, A. K. Kolezhuk, I. P. McCulloch +1
We use the dynamical density matrix renormalization group technique to show that the high-energy part of the spectrum of a S=1 Haldane chain, placed in a strong external magnetic f…
Enhancement of pairwise entanglement from $\mathbbm{Z}_2$ symmetry breaking
A. Osterloh, G. Palacios, S. Montangero
We study the effect of symmetry breaking in a quantum phase transition on pairwise entanglement in spin-1/2 models. We give a set of conditions on correlation functions a model has…
Spin and charge dynamics of the one-dimensional extended Hubbard model
H. Benthien, E. Jeckelmann
We investigate the dynamical spin and charge structure factors and the one-particle spectral function of the one-dimensional extended Hubbard model at half band-filling using the d…
The spin-Peierls chain revisited
Georg Hager, Alexander Weisse, Gerhard Wellein +2
We extend previous analytical studies of the ground-state phase diagram of a one-dimensional Heisenberg spin chain coupled to optical phonons, which for increasing spin-lattice cou…
Anderson-like impurity in the one-dimensional t-J model: formation of local states and magnetic behaviour
Holger Frahm, Guillaume Palacios
We consider an integrable model describing an Anderson-like impurity coupled to an open -- chain. Both the hybridization (i.e. its coupling to bulk chain) and the local spect…
Finite Temperature Dynamics of the Spin 1/2 Bond Alternating Heisenberg Antiferromagnetic Chain
H. -J. Mikeska, C. Luckmann
We present results for the dynamic structure factor of the S=1/2 bond alternating Heisenberg chain over a large range of frequencies and temperatures. Data are obtained from a nume…