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arXiv 1604.02548math-phcond-mat.stat-mechmath.MP
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量子海森堡铁磁体大S极限下自旋波理论的相互作用修正

Interaction Corrections to Spin-Wave Theory in the Large-S Limit of the Quantum Heisenberg Ferromagnet

Niels Benedikter

摘要:

量子海森堡铁磁体可以很自然地用相互作用玻色子(称为自旋波或磁振子)重新表述为逆自旋尺寸的扩展。我们计算了自由能的一阶相互作用修正,作为自旋大小$S \to \infty$和$βS$固定的极限中的上限($β$是逆温度)。我们的结果是有效的,在二维和三维空间。我们将所得结果外推与Dyson的低温膨胀作了比较。虽然我们的一阶修正具有预期的温度依赖性,但在更高阶的微扰理论中,取消是必要的。

英文摘要:

The Quantum Heisenberg Ferromagnet can be naturally reformulated in terms of interacting bosons (called spin waves or magnons) as an expansion in the inverse spin size. We calculate the first order interaction correction to the free energy, as an upper bound in the limit where the spin size $S \to \infty$ and $βS$ is fixed ($β$ being the inverse temperature). Our result is valid in two and three spatial dimensions. We extrapolate our result to compare with Dyson's low-temperature expansion. While our first-order correction has the expected temperature dependance, in higher orders of the perturbation theory cancellations are necessary.

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