dorsal/arxiv
View SchemaScissors modes in triaxial metal clusters
| Authors | P. -G. Reinhard, V. O. Nesterenko, E. Suraud, S. El Gammal, W. Kleinig |
|---|---|
| Categories | |
| ArXiv ID | physics/0203019 |
| URL | https://arxiv.org/abs/physics/0203019 |
| DOI | 10.1103/PhysRevA.66.013206 |
| Journal | Phys. Rev. A66, 013206 (1-8) (2002). |
Abstract
We study the scissors mode (orbital M1 excitations) in small Na clusters, triaxial metal clusters ${\rm Na}_{12}$ and ${\rm Na}_{16}$ and the close-to-spherical ${{\rm Na}_9}^+$, all described in DFT with detailed ionic background. The scissors modes built on spin-saturated ground and spin-polarized isomeric states are analyzed in virtue of both macroscopic collective and microscopic shell-model treatments. It is shown that the mutual destruction of Coulomb and the exchange-correlation parts of the residual interaction makes the collective shift small and the net effect can depend on details of the actual excited state. The crosstalk with dipole and spin-dipole modes is studied in detail. In particular, a strong crosstalk with spin-dipole negative-parity mode is found in the case of spin-polarized states. Triaxiality and ionic structure considerably complicate the scissors response, mainly at expense of stronger fragmentation of the strength. Nevertheless, even in these complicated cases the scissors mode is mainly determined by the global deformation. The detailed ionic structure destroys the spherical symmetry and can cause finite M1 response (transverse optical mode) even in clusters with zero global deformation. But its strength turns out to be much smaller than for the genuine scissors modes in deformed systems.
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"abstract": "We study the scissors mode (orbital M1 excitations) in small Na clusters,\ntriaxial metal clusters ${\\rm Na}_{12}$ and ${\\rm Na}_{16}$ and the\nclose-to-spherical ${{\\rm Na}_9}^+$, all described in DFT with detailed ionic\nbackground. The scissors modes built on spin-saturated ground and\nspin-polarized isomeric states are analyzed in virtue of both macroscopic\ncollective and microscopic shell-model treatments. It is shown that the mutual\ndestruction of Coulomb and the exchange-correlation parts of the residual\ninteraction makes the collective shift small and the net effect can depend on\ndetails of the actual excited state. The crosstalk with dipole and spin-dipole\nmodes is studied in detail. In particular, a strong crosstalk with spin-dipole\nnegative-parity mode is found in the case of spin-polarized states. Triaxiality\nand ionic structure considerably complicate the scissors response, mainly at\nexpense of stronger fragmentation of the strength. Nevertheless, even in these\ncomplicated cases the scissors mode is mainly determined by the global\ndeformation. The detailed ionic structure destroys the spherical symmetry and\ncan cause finite M1 response (transverse optical mode) even in clusters with\nzero global deformation. But its strength turns out to be much smaller than for\nthe genuine scissors modes in deformed systems.",
"arxiv_id": "physics/0203019",
"authors": [
"P. -G. Reinhard",
"V. O. Nesterenko",
"E. Suraud",
"S. El Gammal",
"W. Kleinig"
],
"categories": [
"physics.atm-clus",
"physics.atom-ph"
],
"doi": "10.1103/PhysRevA.66.013206",
"journal_ref": "Phys. Rev. A66, 013206 (1-8) (2002).",
"title": "Scissors modes in triaxial metal clusters",
"url": "https://arxiv.org/abs/physics/0203019"
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