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arXiv 0705.3818cond-mat.str-el
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强关联局域系统II中的场相关准粒子

Field dependent quasiparticles in a strongly correlated local system II

J. Bauer, A. C. Hewson

摘要:

我们将早期工作中提出的磁场中对称Anderson模型的重整化准粒子描述$H$推广到非对称模型。从低能NRG不动点导出了任意场值下的重整化参数。我们发现准粒子共振宽度,$\tildeΔ_σ(H)$,这取决于一般的自旋$σ$以及$H$。低温下的静态性质可以完全用这些参数来表示,这些参数也可以作为重整化微扰理论的输入。我们表明,考虑到重复准粒子散射给出的纵向和横向动态自旋极化率是非常好的协议,从直接NRG计算得到的结果。

英文摘要:

We extend the renormalized quasiparticle description of the symmetric Anderson model in a magnetic field $H$, developed in earlier work, to the non-symmetric model. The renormalized parameters are deduced from the low energy NRG fixed point for arbitrary field values. We find quasiparticle resonance widths, $\tildeΔ_σ(H)$, which depend in general on the spin $σ$ as well as $H$. The low temperature static properties can be expressed completely in terms of these parameters, which can also be used as inputs for a renormalized perturbation theory. We show that taking into account repeated quasiparticle scattering gives results for the longitudinal and transverse dynamic spin susceptibilities which are in very good agreement with those obtained from direct NRG calculations.

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