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Spin-dependent dipole excitation in alkali-metal nanoparticles

机译:碱金属纳米粒子中自旋相关的偶极激发

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摘要

We study the spin-dependent electronic excitations in alkali-metal nanoparticles. Using numerical and analytical approaches, we focus on the resonances in the response to spin-dependent dipole fields. In the spin-dipole absorption spectrum for closed-shell systems, we investigate in detail the lowest-energy excitation, the "surface paramagnon" predicted by Serra et al. [Phys. Rev. A 47, R1601 (1993)]. We estimate its frequency from simple assumptions for the dynamical magnetization density. In addition, we numerically determine the dynamical magnetization density for all low-energy spin-dipole modes in the spectrum. Those many-body excitations can be traced back to particle-hole excitations of the noninteracting system. In open-shell systems, the spin-dipole response to an electrical dipole field is found to increase proportionally with the ground-state spin polarization.
机译:我们研究了碱金属纳米粒子中自旋相关的电子激发。使用数值和分析方法,我们专注于响应自旋相关的偶极子场的共振。在封闭壳系统的自旋偶极子吸收光谱中,我们详细研究了最低能量激发,即Serra等人预测的“表面超磁子”。 [物理修订版A 47,R1601(1993)]。我们根据简单的动态磁化密度假设来估算其频率。此外,我们在数值上确定了光谱中所有低能自旋偶极子模式的动态磁化强度。这些多体激发可以追溯到非相互作用系统的粒子孔激发。在开壳系统中,发现对偶极电场的自旋偶极子响应与基态自旋极化成比例地增加。

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