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arXiv 2302.00465math-phcond-mat.stat-mechmath.MP
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平均场量子自旋系统中的谱隙与低能谱

The Spectral Gap and Low-Energy Spectrum in Mean-Field Quantum Spin Systems

Chokri Manai, Simone Warzel

AI总结:

研究利用自旋相干态的半经典分析,对平均场自旋哈密顿量的谱隙进行分类并给出公式,且通过二阶近似描述有隙系统的低能谱,同时揭示球面几何导致的平移。

摘要:

本文采用基于自旋相干态的半经典分析,建立了平均场自旋哈密顿量谱隙的分类与公式。对于有隙系统,我们基于对半经典哈密顿量的二阶近似,对低能谱给出了完整描述,从而证明了该情形下零温涨落理论的合理性。我们还指出了这些二阶近似中由球面几何引起的一个平移。

英文摘要:

A semiclassical analysis based on spin-coherent states is used to establish a classification and formulae for the spectral gap of mean-field spin Hamiltonians. For gapped systems we provide a full description of the low-energy spectra based on a second-order approximation to the semiclassical Hamiltonian hence justifying fluctuation theory at zero temperature for this case. We also point out a shift caused by the spherical geometry in these second-order approximations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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