Domain-wall melting in ultracold-boson systems with hole and spin-flip defects

Halimeh, Jad C., Wollert, Anton, McCulloch, Ian, Schollwock, Ulrich and Barthel, Thomas (2014) Domain-wall melting in ultracold-boson systems with hole and spin-flip defects. Physical Review A - Atomic, Molecular, and Optical Physics, 89 6: . doi:10.1103/PhysRevA.89.063603

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Author Halimeh, Jad C.
Wollert, Anton
McCulloch, Ian
Schollwock, Ulrich
Barthel, Thomas
Title Domain-wall melting in ultracold-boson systems with hole and spin-flip defects
Journal name Physical Review A - Atomic, Molecular, and Optical Physics   Check publisher's open access policy
ISSN 1050-2947
1094-1622
Publication date 2014-06-04
Year available 2014
Sub-type Article (original research)
DOI 10.1103/PhysRevA.89.063603
Open Access Status File (Publisher version)
Volume 89
Issue 6
Total pages 14
Place of publication College Park, MD United States
Publisher American Physical Society
Language eng
Abstract Quantum magnetism is a fundamental phenomenon of nature. As of late, it has garnered a lot of interest because experiments with ultracold atomic gases in optical lattices could be used as a simulator for phenomena of magnetic systems. A paradigmatic example is the time evolution of a domain-wall state of a spin-1/2 Heisenberg chain, the so-called domain-wall melting. The model can be implemented by having two species of bosonic atoms with unity filling and strong on-site repulsion U in an optical lattice. In this paper, we study the domain-wall melting in such a setup on the basis of the time-dependent density matrix renormalization group (tDMRG). We are particularly interested in the effects of defects that originate from an imperfect preparation of the initial state. Typical defects are holes (empty sites) and flipped spins. We show that the dominating effects of holes on observables like the spatially resolved magnetization can be taken account of by a linear combination of spatially shifted observables from the clean case. For sufficiently large U, further effects due to holes become negligible. In contrast, the effects of spin flips are more severe as their dynamics occur on the same time scale as that of the domain-wall melting itself. It is hence advisable to avoid preparation schemes that are based on spin flips.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2015 Collection
 
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