Anomalous relaxation and the high-temperature structure factor of XXZ spin chains

Anomalous relaxation and the high-temperature structure factor of XXZ spin chains
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XXZ自旋链的反常弛豫与高温结构因子

DOI:
10.1073/pnas.1906914116
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发表时间:
2019
期刊:
Proceedings of the National Academy of Sciences
影响因子:
--
通讯作者:
Ware, Brayden
Ware, Brayden
中科院分区:
--
文献类型:
--
作者:
Gopalakrishnan, Sarang;Vasseur, Romain;Ware, Brayden

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我们计算的自旋结构因子XXZ自旋链的海森堡和间隙(伊辛)制度在高温极限非零磁化,广义流体力学的框架内,包括扩散修正。的结构因子示出了一个层次的时间尺度在带隙阶段,由于自旋磁振子束缚态(“字符串”)的各种大小。虽然短弦的运动是弹道式的,但长弦的运动主要是扩散式的,这是它们与短弦碰撞的结果。这些影响之间的相互作用引起的自旋结构因子的异常幂律衰减,与连续变化的指数,在任何固定的间隔在后期的时间限制。我们阐明的交叉扩散(在有间隙的阶段)和超扩散(在各向同性点)的半填充极限。我们通过广泛的矩阵乘积运算验证了我们的结果。
We compute the spin-structure factor of XXZ spin chains in the Heisenberg and gapped (Ising) regimes in the high-temperature limit for nonzero magnetization, within the framework of generalized hydrodynamics, including diffusive corrections. The structure factor shows a hierarchy of timescales in the gapped phase, owing to-spin magnon bound states (“strings”) of various sizes. Although short strings move ballistically, long strings move primarily diffusively as a result of their collisions with short strings. The interplay between these effects gives rise to anomalous power-law decay of the spin-structure factor, with continuously varying exponents, at any fixed separation in the late-time limit. We elucidate the cross-over to diffusion (in the gapped phase) and to superdiffusion (at the isotropic point) in the half-filling limit. We verify our results via extensive matrix product operator calculations.
DOI: 10.1017/cbo9780511524332.002
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