Twist Mode in Spherical Alkali Metal Clusters

Abstract

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.

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

References in corpus (1)

• Orbital Magnetic Dipole Mode in Deformed Clusters: A Fully Microscopic Analysis

Cited by in corpus (6)

• Magnetic dipole excitations in nuclei: elementary modes of nucleonic motion
• Raman scattering by electron-hole excitations in silver nanocrystals
• Scissors modes in triaxial metal clusters
• The Twist Mode in Atomic Fermi Gases
• Microscopic description of the twist mode in normal and superfluid trapped Fermi gases
• Orbital magnetism in axially deformed sodium clusters: From scissors mode to dia-para magnetic anisotropy