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Quasiparticle interactions in frustrated Heisenberg chains

Autor(en)
Laurens Vanderstraeten, Jutho Haegeman, Frank Verstraete, Didier Poilblanc
Abstrakt

Interactions between elementary excitations in quasi-one-dimensional antiferromagnets are of experimental relevance and their quantitative theoretical treatment has been a theoretical challenge for many years. Using matrix product states, one can explicitly determine the wave functions of the one-and two-particle excitations, and, consequently, the contributions to dynamical correlations. We apply this framework to the (nonintegrable) frustrated dimerized spin-1/2 chain, a model for generic spin-Peierls systems, where low-energy quasiparticle excitations are bound states of topological solitons. The spin structure factor involving two quasiparticle scattering states is obtained in the thermodynamic limit with full momentum and frequency resolution. This allows very subtle features in the two-particle spectral function to be revealed which, we argue, could be seen, e.g., in inelastic neutron scattering of spin-Peierls compounds under a change of the external pressure.

Organisation(en)
Quantenoptik, Quantennanophysik und Quanteninformation
Externe Organisation(en)
Ghent University , Laboratoire de Physique Théorique (LPT - IRSAMC), Université Toulouse III Paul Sabatier
Journal
Physical Review B
Band
93
Anzahl der Seiten
8
ISSN
1098-0121
DOI
https://doi.org/10.1103/PhysRevB.93.235108
Publikationsdatum
06-2016
Peer-reviewed
Ja
ÖFOS 2012
103025 Quantenmechanik, 103015 Kondensierte Materie
Schlagwörter
ASJC Scopus Sachgebiete
Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/4dd721cf-16a3-4d6c-8d13-85c9e4a31492