Entanglement and factorized ground states in two-dimensional quantum antiferromagnets (Articolo in rivista)

Type
Label
  • Entanglement and factorized ground states in two-dimensional quantum antiferromagnets (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevLett.94.147208 (literal)
Alternative label
  • Roscilde, T (1); Verrucchi, P (2,3); Fubini, A (4,6); Haas, S (1); Tognetti, V (2,4,5); (2005)
    Entanglement and factorized ground states in two-dimensional quantum antiferromagnets
    in Physical review letters (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Roscilde, T (1); Verrucchi, P (2,3); Fubini, A (4,6); Haas, S (1); Tognetti, V (2,4,5); (literal)
Pagina inizio
  • 147208 (literal)
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  • http://link.aps.org/doi/10.1103/PhysRevLett.94.147208 (literal)
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  • 94 (literal)
Rivista
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  • 4 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • 1. Univ So Calif, Dept Phys & Astron, Los Angeles, CA 90089 USA 2. UdR Firenze, Ist Nazl Fis Mat, I-50019 Sesto Fiorentino, FI, Italy 3. CNR, Sez Firenze, Ist Sistemi Complessi, I-50019 Sesto Fiorentino, FI, Italy 4. Univ Florence, Dipartimento Fis, I-50019 Sesto Fiorentino, FI, Italy 5. Ist Nazl Fis Nucl, Sez Firenze, I-50019 Sesto Fiorentino, FI, Italy 6. Univ Catania, MATIS INFM, I-95125 Catania, Italy and DMFCI, I-95125 Catania, Italy (literal)
Titolo
  • Entanglement and factorized ground states in two-dimensional quantum antiferromagnets (literal)
Abstract
  • Making use of exact results and quantum Monte Carlo data for the entanglement of formation, we show that the ground state of anisotropic two-dimensional S=1/2 antiferromagnets in a uniform field takes the classical-like form of a product state for a particular value and orientation of the field, at which the purely quantum correlations due to entanglement disappear. Analytical expressions for the energy and the form of such states are given, and a novel type of exactly solvable two-dimensional quantum models is therefore singled out. Moreover, we show that the field-induced quantum phase transition present in the models is unambiguously characterized by a cusp minimum in the pairwise-to-global entanglement ratio R, marking the quantum-critical enhancement of multipartite entanglement. (literal)
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