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The effect of the Berry phase is included explicitly in the wavefunctiondescribing conduction electrons in a crystal composed of periodically arrayedJahn-Teller centers that have conically intersecting potential energy surfaces.The Berry phase can make a drastic change in the band structure, leadinggenerally to the formation of an orbital-density-wave state. We discussimplications of our theory and possible relations to the orbital orderingobserved in the manganese perovskites.Comment: 4 pages. 3 eps figures. RevTex. Submitted to Phys. Rev. Let

Bloch Electrons in a Jahn-Teller Crystal and an Orbital-Density-Wave State due to the Berry Phase