Theory of inelastic scattering from magnetic impurities.
Theory of inelastic scattering from magnetic impurities.
复制标题
磁性杂质的非弹性散射理论。
DOI：
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发表时间：
2004
影响因子：
8.6
通讯作者：
N. Andrei
中科院分区：
文献类型：
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作者：
G. Zaránd;L. Borda;J. von Delft;N. Andrei
我们采用数值重正化群方法计算了T=0温度下磁性杂质散射的传导电子多体T矩阵的单粒子矩阵元素T。由于 T 决定了总的和弹性的自旋对角散射截面，因此我们能够计算非弹性散射截面 sigma(inel)(omega) 的全部能量、自旋和磁场依赖性。我们发现低于近藤温度 T(K) 的 sigma(inel)(omega) 几乎呈线性频率依赖性，只有在极低的能量下才会交叉到 omega(2) 行为。我们的方法可以推广到其他量子杂质模型。
We use the numerical renormalization group method to calculate the single-particle matrix elements T of the many-body T matrix of the conduction electrons scattered by a magnetic impurity at T=0 temperature. Since T determines both the total and the elastic, spin-diagonal scattering cross sections, we are able to compute the full energy, spin, and magnetic field dependence of the inelastic scattering cross section sigma(inel)(omega). We find an almost linear frequency dependence of sigma(inel)(omega) below the Kondo temperature T(K), which crosses over to a omega(2) behavior only at extremely low energies. Our method can be generalized to other quantum impurity models.