Primary role of the barely occupied states in the charge density wave formation of NbSe2

Abstract

NbSe2 is a prototypical charge-density-wave (CDW) material, whose mechanism remains mysterious so far. With angle resolved photoemission spectroscopy, we mapped out the CDW gap and 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 surface with negligible DOS at the Fermi energy. We show that the major contributions to the CDW 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.

5 pages, 4 figures

References in corpus (3)

• Quasi-Particle Spectra, Charge-Density-Wave, Superconductivity and Electron-Phonon Coupling in 2H-NbSe2
• Penetration depth study of superconducting gap structure of 2\textit{H}-NbSe${}_2$
• Gapless Fermi Surfaces in anisotropic multiband superconductors in magnetic field

Cited by in corpus (15)

• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
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• A quantum phase transition from triangular to stripe charge order in NbSe${}_2$
• Emergence of new van Hove singularities in the charge density wave state of a topological kagome metal RbV3Sb5
• Strong correlation and massive spectral-weight redistribution induced spin density wave in a-Fe1.06Te
• Hierarchical stripe phases in IrTe2 driven by competition between Ir dimerization and Te bonding
• Quasiparticle energy bands and Fermi surfaces of monolayer NbSe${}_2$
• Optical spectroscopy and ultrafast pump-probe study of structural phase transition in 1T'-TaTe2
• Persistent exchange splitting in a chiral helimagnet Cr1/3NbS2
• Photoemission study of the electronic structure and charge density waves of Na2Ti2Sb2O
• Charge-Density-Wave Order in 2H-NbSe${}_2$
• Charge Density Waves and the Effects of Uniaxial Strain on the Electronic Structure of 2H-NbSe${}_2$
• Dichotomy of saddle points in energy bands of a monolayer NbSe${}_2$
• Multimorphism and gap opening of charge-density-wave phases in monolayer VTe2
• Nesting-driven antiferromagnetic order in Kondo lattice CePd5Al2