Orbital Order Instability and Orbital Excitations in Degenerate Itinerant Electron Systems

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We present the theory of orbital ordering in orbital-degenerate itinerant electron systems. After proposing the criterion of instability for orbital ordering or orbital density wave ordering, we find that the orbital and the spin-orbital collective excitation spectra in ferro-orbital ordered phase exhibit finite gaps. The anomalous electronic energy spectra manifested in the angle-resolved photoemission spectroscopy (ARPES) and the orbital occupation in the resonant X-ray scattering (RXS) intensities are also presented for the orbital-ordered phase.
5 pages, 3 figures

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Materials Science, Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/110894

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0605379
 http://arxiv.org/abs/cond-mat/0605379

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arXiv