Abstract's Details

Evidence of the Existence of a Point Gap: Telluride Revisited by ARPES
Abstract ID	MAT-20
Presenter	Ruihua He
Presentation Type	Poster
Full Author List	R.-H. He (1), V. Brouet (2), K. Shin (1), N. Ru (1), H. Yao (1), D. Lu (1), W. Meevasana (1), S. Kivelson (1), I. Fisher (1), Z.-X. Shen (1)
Affiliations	(1) Dept. of Physics, Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, CA 94305 (2) Laboratoire de Physique des solides d'Orsay, France
Category	Materials Science
Abstract	By using angle-resolved photoemission spectroscopy based on synchrotron radiation as well as monochromatic He-I UV, we have revisited the complex charge density wave (CDW) material, Gd₂Te₅ and its structural building block, GdTe₃. We discussed some features in the electronic structure of these two systems which might go beyond the CDW physics based on the well-studied 1D on-axis incommensurate CDW nesting wave vector, (0, 2/7). We suggested a distinct CDW formation driven by the electronic instability of an interaction-induced high-spectral-weight hole pocket, which is highly confined in the momentum space, might explain these features. The associated possible CDW wave vectors include (1/3,1/3), found by XRD/TEM in bulk Gd₂Te₅, and (2/3,0), found by STM on surface of GdTe₃.
Footnotes
Funding Acknowledgement	This work is supported by DOE Office of Science, Division of Materials Science, with contract DE-FG03-01ER45929-A001 and NSF grant DMR-0604701. R.H. would like to acknowledge the support by Stanford Graduate Fellowship.