Primary Role of the Barely Occupied States in the Charge Density Wave Formation ofNbSe2

2008/06/30 by Dawei Shen, D. W. Shen, Yiting Zhang +21 · 1 citation
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Organic and Molecular Conductors Research #Physics of Superconductivity and Magnetism #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.101.226406

5 pages, 4 figures

arxiv created 2008/11/02 · openalex publication_date 2008/11/26 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/03

Abstract

NbSe2 is a prototypical charge-density-wave (CDW) material, whose mechanism remains mysterious so far. With angle resolved photoemission spectroscopy, we recovered the long-lost nesting condition over a large broken-honeycomb region in the Brillouin zone, which consists of six saddle band point regions with high density of states (DOS), and large regions away from Fermi surfaces with negligible DOS at the Fermi energy. We show that the major contributions to the CDW formation come from these barely occupied states rather than the saddle band points. Our findings not only resolve a long-standing puzzle, but also overthrow the conventional wisdom that CDW is dominated by regions with high DOS.

Citations

• Nondispersive Fermi Arcs and the Absence of Charge Ordering in the Pseudogap Phase ofBi2Sr2CaCu2O8+δ
• Quasiparticle Spectra, Charge-Density Waves, Superconductivity, and Electron-Phonon Coupling in2H−NbSe2
• Elastic Scattering Susceptibility of the High Temperature SuperconductorBi2Sr2CaCu2O8+δ: A Comparison between Real and Momentum Space Photoemission Spectroscopies
• Penetration Depth Study of Superconducting Gap Structure of2H−NbSe2
• Heat Conduction in the Vortex State ofNbSe2: Evidence for Multiband Superconductivity
• Destruction of the Fermi surface in underdoped high-Tc superconductors

Cited by

• Angle-resolved photoemission studies of quantum materials