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- German Research Centre for Artificial IntelligenceDE125 papers
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6 papers · 2 filters
Particle injection into a chain: decoherence versus relaxation for Hermitian and non-Hermitian dynamics
F. Gebhard, K. zu Muenster, J. Ren +3
We investigate a model system for the injection of fermionic particles from filled source sites into an empty chain. We study the ensuing dynamics for Hermitian as well as for non-…
The dimerized ferromagnetic Heisenberg chain
A. Herzog, P. Horsch, A. M. Oles +1
Ferromagnetic, in contrast to antiferromagnetic, Heisenberg chains can undergo a Spin-Peierls dimerization only at finite temperatures. They show reentrant behavior as a function o…
The J1-J2 Heisenberg model at and close to its z=4 quantum critical point
J. Sirker, V. Y. Krivnov, D. V. Dmitriev +5
We study the frustrated J1-J2 Heisenberg model with ferromagnetic nearest neighbor coupling J1<0 and antiferromagnetic next-nearest neighbor coupling J2>0 at and close to the z=4 q…
Lightcone renormalization and quantum quenches in one-dimensional Hubbard models
Tilman Enss, Jesko Sirker
The Lieb-Robinson bound implies that the unitary time evolution of an operator can be restricted to an effective light cone for any Hamiltonian with short-range interactions. Here…
Spin exchange dominated by charge fluctuations of the Wigner lattice in the newly synthesized chain cuprate Na5Cu3O6
N. Zafar Ali, J. Sirker, J. Nuss +2
Na5Cu3O6, a new member of one dimensional charge ordered chain cuprates, was synthesized via the azide/nitrate route by reacting NaN3, NaNO3 and CuO. According to single crystal X-…
Electron scattering from domain walls in ferromagnetic Luttinger liquids
N. Sedlmayr, S. Eggert, J. Sirker
We study the properties of interacting electrons in a one-dimensional conduction band coupled to bulk non-collinear ferromagnetic order. The specific form of non-collinearity we co…