Quasiparticle Interference, quasiparticle interactions and the origin of the charge density-wave in 2H-NbSe${}_2$

Abstract

We show that a small number of intentionally introduced defects can be used as a spectroscopic tool to amplify quasiparticle interference in 2H-NbSe${}_2$, that we measure by scanning tunneling spectroscopic imaging. We show from the momentum and energy dependence of the quasiparticle interference that Fermi surface nesting is inconsequential to charge density wave formation in 2H-NbSe${}_2$. We demonstrate that by combining quasiparticle interference data with additional knowledge of the quasiparticle band structure from angle resolved photoemission measurements, one can extract the wavevector and energy dependence of the important electronic scattering processes thereby obtaining direct information both about the fermiology and the interactions. In 2H-NbSe${}_2$, we use this combination to show that the important near-Fermi-surface electronic physics is dominated by the coupling of the quasiparticles to soft mode phonons at a wave vector different from the CDW ordering wave vector.

Main text: 13 pages, 4 figures (single column). In this version: More references included, larger figures. First version did not contained the supplementary material. This version includes the supplementary material within the same file (8 pages, 7 figures)

References in corpus (5)

• An Intrinsic Bond-Centered Electronic Glass with Unidirectional Domains in Underdoped Cuprates
• Charge density wave origin of cuprate checkerboard visualized by scanning tunneling microscopy
• Two energy gaps and Fermi surface 'arcs' in NbSe2
• Quasi-Particle Spectra, Charge-Density-Wave, Superconductivity and Electron-Phonon Coupling in 2H-NbSe2
• Fermi surface nesting in several transition metal dichalcogenides

Cited by in corpus (7)

• Charge density waves and phonon-electron coupling in ZrTe${}_3$ investigated by Raman spectroscopy and first-principles calculations
• Quasiparticle Interference Studies of Quantum Materials
• Spin-orbit scattering visualized in quasiparticle interference
• Quasiparticle energy bands and Fermi surfaces of monolayer NbSe${}_2$
• Quantum phase transition in few-layer NbSe${}_2$ probed through quantized conductance fluctuations
• Van der Waals Schottky barriers as interface probes of the correlation between chemical potential shifts and charge density wave formation in 1T-TiSe${}_2$ and 2H-NbSe${}_2$
• Sub-nanometer optical linewidth of thulium atoms in rare gas crystals