Fermi surface of 2H-TaSe{sub 2} and its relation to the charge-density wave

Journal Article · Tue Feb 15 04:00:00 EST 2000 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.61.5212· OSTI ID:20215511

Liu, Rong ^[1]; Tonjes, W C ^[1]; Greanya, V A ^[1]; Olson, C G ^[2]; Frindt, R F ^[3]

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1. Department of Physics and Astronomy, and Center for Fundamental Materials Research, Michigan State University, East Lansing, Michigan 48824 (United States)
2. Ames Laboratory, Ames, Iowa 50011 (United States)
3. Department of Physics, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6 (Canada)

The Fermi surface (FS) of 2H-TaSe{sub 2} was investigated by high resolution angle resolved photoemission. Two FS pockets, one centered at the {gamma} point and the other centered at the K point, were observed and are found to be in excellent agreement with the band calculation results. Although the FS centered at the {gamma} point appears to have nested segments with the observed charge density wave (CDW) wave vectors, the CDW-induced energy gap is nearly zero on that FS. Instead, the gap opens in the extended saddle band region and on the FS centered at the K point. The implication of these results on the CDW mechanism is discussed. (c) 2000 The American Physical Society.

• OSTI ID: 20215511
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 8 Vol. 61; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHARGE DENSITY
ELECTRONIC STRUCTURE
ENERGY GAP
EXPERIMENTAL DATA
FERMI LEVEL
PHOTOELECTRON SPECTROSCOPY
PHOTOEMISSION
TANTALUM SELENIDES