Entanglement Entropy Bounds in the Higher Spin XXZ Chain
英文摘要：
We consider the Heisenberg XXZ spin-$J$ chain ($J\in\mathbb{N}/2$) with anisotropy parameter $Δ$. Assuming that $Δ>2J$, and introducing threshold energies $E_{K}:=K\left(1-\frac{2J}Δ\right)$, we show that the bipartite entanglement entropy (EE) of states belonging to any spectral subspace with energy less than $E_{K+1}$ satisfy a logarithmically corrected area law with prefactor $(2\lfloor K/J\rfloor-2)$. This generalizes previous results by Beaud and Warzel as well as Abdul-Rahman, Stolz and one of the authors, who covered the spin-$1/2$ case.
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