| Autor: |
T. R. F. Peixoto, I Tudosa, Kh. Zakeri, J. Kirschner, Valeri S. Stepanyuk, J Prokop, P. A. Ignatiev, Yu Zhang, Wen-Xin Tang |
| Rok vydání: |
2010 |
| Předmět: |
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| Zdroj: |
Physical review letters. 106(12) |
| ISSN: |
1079-7114 |
| Popis: |
It was realized at the very beginning of the development of the quantum theory of condensed matter that, although solids are composed of atoms, they cannot be described using atomic properties only. The reason lies in the collective phenomena that appears in solids. They should undoubtedly be taken into account when excitations are studied. Collective excitations in solids can be described by their representative quasiparticles. For instance, the collective modes of the latticevibrations arewell described by phonons. Phonons are characterized by their dispersion relation, which links the energies of the excitations to their propagating wave vectors. In magnetic solids there is another kind of collective excitation that originates from the precession of the atomic spins around their equilibrium position. Such excitations have a totally different nature and are called spin waves or magnons. Spin waves are also characterized by their dispersion relation and more importantly they carry a spin of 1 @. The above mentioned |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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