Orbital Order Instability and Orbital Excitations in Degenerate Itinerant Electron Systems

Details Orbital Order Instability and Orbital Excitations in Degenerate Itinerant Electron Systems Orbital Order Instability and Orbital Excitations in Degenerate Itinerant Electron Systems

2006-05-15

arxiv.org/abs/cond-mat/0605379v1

Physics

Condensed Matter

Materials Science

5 pages, 3 figures

Scientific paper

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.

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