Twist Mode in Spherical Alkali Metal Clusters

Details Twist Mode in Spherical Alkali Metal Clusters Twist Mode in Spherical Alkali Metal Clusters

2000-10-02

arxiv.org/abs/cond-mat/0010030v1

Phys.Rev.Lett.85:3141-3144,2000

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 4 figures, to be published in Phys. Rev. Lett., v.85, n.15, 2000

Scientific paper

10.1103/PhysRevLett.85.3141

A remarkable orbital quadrupole magnetic resonance, so-called twist mode, is predicted in alkali metal clusters where it is represented by $I^{\pi}=2^-$ low-energy excitations of valence electrons with strong M2 transitions to the ground state. We treat the twist by both macroscopic and microscopic ways. In the latter case, the shell structure of clusters is fully exploited, which is crucial for the considered size region ($8\le N_e\le 1314$). The energy-weighted sum rule is derived for the pseudo-Hamiltonian. In medium and heavy spherical clusters the twist dominates over its spin-dipole counterpart and becomes the most strong multipole magnetic mode.

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