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arXiv 0905.2076cond-mat.mes-hall
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碱金属纳米粒子中自旋相关的偶极激发

Spin-dependent dipole excitation in alkali-metal nanoparticles

Yue Yin, Paul-Antoine Hervieux, Rodolfo A. Jalabert, Giovanni Manfredi, Emmanuel Maurat, Dietmar Weinmann

摘要:

我们研究了碱金属纳米粒子中自旋相关的电子激发。使用数值和解析方法,我们专注于响应自旋相关的偶极场的共振。在闭壳层体系的自旋偶极吸收谱中,我们详细研究了最低能量的激发,即L。Serra等人[Phys.Rev.A47,R1601(1993)]。我们估计其频率从简单的假设的动态磁化强度密度。此外,我们数值计算确定的动态磁化强度密度为所有低能量的自旋偶极模式的频谱。这些多体激发可以追溯到非相互作用系统的粒子-空穴激发。因此,我们认为,自旋偶极子模式是不集体的性质。在开壳层系统中,自旋偶极响应的电偶极场被发现与基态自旋极化成比例地增加。

英文摘要:

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 L. 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. Thus, we argue that the spin-dipole modes are not of collective nature. In open-shell systems, the spin-dipole response to an electrical dipole field is found to increase proportionally with the ground-state spin polarization.

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