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19 April 2024 |
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Article overview
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Quantum walk versus stone in pond: Distinguishing ground states of quantum magnets by spacetime dynamics | Piotr Wrzosek
; Krzysztof Wohlfeld
; Tomasz Sowiński
; Michael A. Sentef
; | Date: |
3 Feb 2020 | Abstract: | We investigate the wavepacket 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
the wave pattern of a stone thrown into a pond. 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 new opportunities for real-time, real-space imaging of quantum magnets
both in materials science and in quantum simulators. | Source: | arXiv, 2002.0812 | Services: | Forum | Review | PDF | Favorites |
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