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A novel mechanism of charge density wave in a transition metal dichalcogenide

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arxiv cond-mat/0612064 v3 pith:MD4HUYM3 submitted 2006-12-03 cond-mat.str-el cond-mat.supr-con

D. W. Shen , B. P. Xie , J. F. Zhao , L. X. Yang , L. Fang , J. Shi , R. H. He , D. H. Lu
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H. H. Wen D. L. Feng
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classification cond-mat.str-elcond-mat.supr-con
keywords chargedensitydichalcogenidefermimechanismmetaltransitionwave
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Charge density wave, or CDW, is usually associated with Fermi surfaces nesting. We here report a new CDW mechanism discovered in a 2H-structured transition metal dichalcogenide, where the two essential ingredients of CDW are realized in very anomalous ways due to the strong-coupling nature of the electronic structure. Namely, the CDW gap is only partially open, and charge density wavevector match is fulfilled through participation of states of the large Fermi patch, while the straight FS sections have secondary or negligible contributions.

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