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.

arXiv comment5 pages, 4 figures

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Cited by in corpus (30)

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• Multiband superconductivity with sign-preserving order parameter in kagome superconductor CsV3Sb5
• A quantum phase transition from triangular to stripe charge order in NbSe${}_2$
• Emergence of coherence in the charge-density wave state of 2H-NbSe${}_2$
• Emergence of new van Hove singularities in the charge density wave state of a topological kagome metal RbV3Sb5
• Spin-valley locking in the normal state of a transition-metal dichalocogenide superconductor
• Anharmonic suppression of Charge density wave in 2H-NbS${}_2$
• CDW slips and giant frictional dissipation peaks at the NbSe${}_2$ surface
• Strong correlation and massive spectral-weight redistribution induced spin density wave in a-Fe1.06Te
• Dirac point metamorphosis from third-neighbor couplings in graphene
• Strong electron-lattice coupling as the mechanism behind charge density wave transformations in transition-metal dichalcogenides
• Three-dimensional Fermi surface of 2H-NbSe${}_2$ - Implications for the mechanism of charge density waves
• Hierarchical stripe phases in IrTe2 driven by competition between Ir dimerization and Te bonding
• Ab initio phonon self-energies and fluctuation diagnostics of phonon anomalies: Lattice instabilities from Dirac pseudospin physics in transition metal dichalcogenides
• Quasiparticle energy bands and Fermi surfaces of monolayer NbSe${}_2$
• Electronic structure of the BaTi${}_2$As${}_2$O parent compound of the titanium based oxypnictide superconductor
• Persistent exchange splitting in a chiral helimagnet Cr1/3NbS2
• Optical spectroscopy and ultrafast pump-probe study of structural phase transition in 1T'-TaTe2
• 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${}_2$
• Magnetic Behaviour of the $B{i}_{2-y}S{r}_{y}I{r}_2{O}_7$ Pyrochlore Solid Solution
• Revealing the hidden order in BaTi2As2O via nuclear magnetic resonance
• Out-of-plane nesting driven spin spiral in ultrathin Fe/Cu(001) films
• 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
• Observation of pseudogap in SnSe2 atomic layers grown on graphite