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arXiv 1003.1867cond-mat.str-elhep-th
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Anderson杂质模型的沃德恒等式:泛函方法和精确重整化群的推导

Ward identities for the Anderson impurity model: derivation via functional methods and the exact renormalization group

Peter Kopietz, Lorenz Bartosch, Lucio Costa, Aldo Isidori, Alvaro Ferraz

摘要:

利用泛函方法和精确的重整化群,我们导出了Anderson杂质模型的沃德恒等式。特别是,我们提出了山田-吉田恒等式的非微扰证明,该恒等式将自能低能展开中的某些系数与杂质的热力学粒子数和自旋磁化率联系起来。我们的证明强调了Yamada-Yosida恒等式与U(1)× U(1)对称性的关系,该对称性与磁场中的粒子数和自旋守恒有关。

英文摘要:

Using functional methods and the exact renormalization group we derive Ward identities for the Anderson impurity model. In particular, we present a non-perturbative proof of the Yamada-Yosida identities relating certain coefficients in the low-energy expansion of the self-energy to thermodynamic particle number and spin susceptibilities of the impurity. Our proof underlines the relation of the Yamada-Yosida identities to the U(1) x U(1) symmetry associated with particle number and spin conservation in a magnetic field.

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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