Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session C38: Spin Chains and 1D Magnetism
2:30 PM–5:18 PM,
Monday, March 4, 2019
BCEC
Room: 206B
Sponsoring
Unit:
GMAG
Chair: Roberta Sessoli, University of Florence
Abstract: C38.00009 : The dynamic structure factor in impurity-doped spin chains in a magnetic field
4:30 PM–4:42 PM
Presenter:
Imke Schneider
(University of Kaiserslautern)
Authors:
Imke Schneider
(University of Kaiserslautern)
Kevin Jägering
(University of Kaiserslautern)
Annabelle Bohrdt
(Physics, TU Munich)
Sofia Brenner
(University of Kaiserslautern)
Daniel Wessel
(University of Kaiserslautern)
Sebastian Eggert
(University of Kaiserslautern)
We consider the dynamic structure factor in impurity doped spin-1/2 chains for general anisotropy, magnetic field and momentum. The impurities lead to effectively isolated finite chain segments with a discrete spectrum and characteristic correlations, which have a distinct effect on the dynamic structure factor. We present very accurate results for the low energy spectral weight obtained by numerical Density Matrix Renormalization Group techniques and identify the character of dominant excitations. We find that due to the impurities spectral weight is shifted away from the two-particle continuum into regions where no signal would be expected for undoped chains. Further, we compare with bosonization and find surprisingly good agreement with the numerical results. This has direct relevance for recent experiments on spin chains and ultracold gases and shows that, contrary to expectations, bosonization works especially well for short chains and in the vicinity of divergences.
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