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  Quantum walk versus classical wave: Distinguishing ground states of quantum magnets by spacetime dynamics

Wrzosek, P., Wohlfeld, K., Hofmann, D., Sowiński, T., & Sentef, M. A. (2020). Quantum walk versus classical wave: Distinguishing ground states of quantum magnets by spacetime dynamics. Physical Review B, 102(2): 024440. doi:10.1103/PhysRevB.102.024440.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-A06A-F Version Permalink: http://hdl.handle.net/21.11116/0000-0006-D190-A
Genre: Journal Article

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PhysRevB.102.024440.pdf (Publisher version), 3MB
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PhysRevB.102.024440.pdf
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Open Access. - Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.
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2020
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© the Author(s)

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https://arxiv.org/abs/2002.00812 (Preprint)
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https://dx.doi.org/10.1103/PhysRevB.102.024440 (Publisher version)
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 Creators:
Wrzosek, P.1, Author
Wohlfeld, K.1, Author
Hofmann, D.2, Author              
Sowiński, T.3, Author
Sentef, M. A.2, Author              
Affiliations:
1Faculty of Physics, University of Warsaw, ou_persistent22              
2Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3012828              
3Institute of Physics, Polish Academy of Sciences, ou_persistent22              

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 Abstract: We investigate wave packet spreading after a single spin flip in prototypical two-dimensional ferromagnetic and antiferromagnetic quantum spin systems. We find characteristic spatial magnon density profiles: While the ferromagnet shows a square-shaped pattern reflecting the underlying lattice structure, as exhibited by quantum walkers, the antiferromagnet shows a circular-shaped pattern which hides the lattice structure and instead resembles a classical wave pattern. We trace these fundamentally different behaviors back to the distinctly different magnon energy-momentum dispersion relations and also provide a real-space interpretation. Our findings point to opportunities for real-time, real-space imaging of quantum magnets both in materials science and in quantum simulators.

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Language(s): eng - English
 Dates: 2020-07-092020-02-032020-07-142020-07-242020-07-01
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 2002.00812
DOI: 10.1103/PhysRevB.102.024440
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 102 (2) Sequence Number: 024440 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008