2008/12/15 by Masanori Kohno · 71 citations
Mathematics · Physics and Astronomy · #Algebraic structures and combinatorial models #Ansatz #Antiferromagnetism #Combinatorics #Condensed matter physics #Energy (signal processing) #Heisenberg model #Mathematics #Physics #Physics of Superconductivity and Magnetism #Quantum many-body systems #Quantum mechanics #Saturation (graph theory) #Spins #String (physics) #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.102.037203
published in Physical Review Letters 102(3), 037203 (American Physical Society) · 4 pages, 5 figures; to appear in Phys. Rev. Lett.
arxiv created 2008/12/15 · openalex publication_date 2009/01/22 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Using Bethe-ansatz solutions, this Letter uncovers a well-defined continuum in dynamical structure factor S+-(k,omega) of the spin-1/2 antiferromagnetic Heisenberg chain in magnetic fields. It comes from string solutions that continuously connect the mode of the lowest-energy excitations in the zero-field limit and that of bound states of overturned spins from the ferromagnetic state near the saturation field. The relevance to real materials is confirmed through comparisons with experimental results.