Revealing Charge Density Wave Formation in the LaTe_2 System by Angle Resolved Photoemission Spectroscopy

D. R. Garcia; G. -H. Gweon; S. Y. Zhou; J. Graf; C. M. Jozwiak; M. H. Jung; Y. S. Kwon; A. Lanzara

doi:10.1103/PhysRevLett.98.166403

Revealing Charge Density Wave Formation in the LaTe_2 System by Angle Resolved Photoemission Spectroscopy

Strongly Correlated Electrons 2009-11-13 v3

Authors: D. R. Garcia , G. -H. Gweon , S. Y. Zhou , J. Graf , C. M. Jozwiak , M. H. Jung , Y. S. Kwon , A. Lanzara

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Abstract

We present the first direct study of charge density wave (CDW) formation in quasi-2D single layer LaTe_2 using high-resolution angle resolved photoemission spectroscopy (ARPES) and low energy electron diffraction (LEED). CDW formation is driven by Fermi surface (FS) nesting, however characterized by a surprisingly smaller gap (50meV) than seen in the double layer RTe_3 compounds, extending over the entire FS. This establishes LaTe_2 as the first reported semiconducting 2D CDW system where the CDW phase is FS nesting driven. In addition, the layer dependence of this phase in the tellurides and the possible transition from a stripe to a checkerboard phase is discussed.

Keywords

charge density wave LaTe2 angle resolved photoemission spectroscopy Fermi surface nesting two-dimensional system

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@article{arxiv.cond-mat/0703535,
  title  = {Revealing Charge Density Wave Formation in the LaTe_2 System by Angle Resolved Photoemission Spectroscopy},
  author = {D. R. Garcia and G. -H. Gweon and S. Y. Zhou and J. Graf and C. M. Jozwiak and M. H. Jung and Y. S. Kwon and A. Lanzara},
  journal= {arXiv preprint arXiv:cond-mat/0703535},
  year   = {2009}
}

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4 pages, 4 figures, Published in Phys. Rev. Lett

Revealing Charge Density Wave Formation in the LaTe_2 System by Angle Resolved Photoemission Spectroscopy

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