Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 23, Issue 21, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/23/21/213001
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Funding
- Alexander von Humboldt-Stiftung
- Deutsche Forschungsgemeinschaft
- Bundesministerium fur Bildung und Forschung
- US Department of Energy, Office of Basic Energy Sciences
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The occurrence of charge-density waves in three selected layered transition-metal dichalcogenides-1T-TaS2, 2H-TaSe2 and 1T-TiSe2-is discussed from an experimentalist's point of view with a particular focus on the implications of recent angle-resolved photoelectron spectroscopy results. The basic models behind charge-density-wave formation in low-dimensional solids are recapitulated, the experimental and theoretical results for the three selected compounds are reviewed, and their band structures and spectral weight distributions in the commensurate charge-density-wave phases are calculated using an empirical tight-binding model. It is explored whether the origin of charge-density waves in the layered transition-metal dichalcogenides can be understood in a unified way on the basis of a few measured and calculated parameters characterizing the interacting electron-lattice system. It is found that the predictions of the standard mean-field model agree only semi-quantitatively with the experimental data and that there is not one generally dominant factor driving charge-density-wave formation in this family of layer compounds. The need for further experimental and theoretical scrutiny is emphasized.
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