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Number of results
2010 | 118 | 2 | 366-368
Article title

One-Electron Excitations vs. Collective Excitations in the 1D Falicov-Kimball Model with Hund Coupling at Half Filling

Content
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Languages of publication
EN
Abstracts
EN
The Falicov-Kimball model enriched with Ising-type Hund coupling between spins of itinerant electrons and magnetic ions is studied exactly on finite 1D rings. At half filling (one electron per site) and for the density of magnetic ions equal to 1/2 it is shown that many-electron collective excitations coupled to spin reorientations of the magnetic ions have much lower energy than single electron excitations. This property is caused by energy gaps formed at the Fermi levels in one-electron energy spectra of all relevant magnetic configurations of the ions. Consequently, low temperature properties of the system are not driven by one-particle, elementary electron excitations but many-particle collective excitations, where both electrons and spins of magnetic ions are involved. In addition, it is shown that many-body excitation spectra derived both from spin fluctuations and from charge fluctuations have a regular structure.
Keywords
EN
Contributors
author
  • Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-422 Wrocław, Poland
author
  • Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-422 Wrocław, Poland
References
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  • 3. P. Farkašovský, H. Čenčariková, Eur. Phys. J. B 47, 517 (2005); M. Žonda, Mod. Phys. Lett. B 21, 467 (2007); H. Čenčariková, P. Farkašovský, N. Tomašovičová, M. Žonda, Phys. Status Solidi B 245, 2593 (2008)
  • 4. M. Maśka, K. Czajka, Phys. Rev. B 74, 035109 (2006)
  • 5. M. Barma, V. Subrahmanyam, Phase Transit. B 16, 303 (1989)
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv118n235kz
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