Theory of stripes in quasi two dimensional rare-earth tritellurides

Details Theory of stripes in quasi two dimensional rare-earth tritellurides Theory of stripes in quasi two dimensional rare-earth tritellurides

2006-06-13

arxiv.org/abs/cond-mat/0606304v2

Phys. Rev. B 74, 245126 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

Added contents and references, changed title and figures. Accepted to PRB

Scientific paper

Even though the rare-earth tritellurides are tetragonal materials with a quasi two dimensional (2D) band structure, they have a "hidden" 1D character. The resultant near-perfect nesting of the Fermi surface leads to the formation of a charge density wave (CDW) state. We show that for this band structure, there are two possible ordered phases: A bidirectional "checkerboard" state would occur if the CDW transition temperature were sufficiently low, whereas a unidirectional "striped" state, consistent with what is observed in experiment, is favored when the transition temperature is higher. This result may also give some insight into why, in more strongly correlated systems, such as the cuprates and nickelates, the observed charge ordered states are generally stripes as opposed to checkerboards.

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