Electronic structure of two-dimensional hexagonal diselenides: charge density waves and pseudogap behavior

Abstract

We present theoretical study of electronic structure (spectral functions and Fermi surfaces) for incommensurate pseudogap and charge density wave (CDW) and commensurate CDW phases of quasi two dimensional diselenides 2H-TaSe2 and 2H-NbSe2. Incommensurate pseudogap regime is described within the scenario based on short-range order CDW fluctuations, considered within the static Gaussian random field model. In contrast e.g. to high-Tc cuprates layered dichalcogenides have several different CDW scattering vectors and electronic spectrum with two bands at the Fermi level. To this end we present theoretical background for the description of multiple scattering processes within multiple bands electronic spectrum. Thus obtained theoretical spectral functions and Fermi surfaces are compared with recent ARPES experimental data, demonstrating rather good qualitative agreement.

22 pages, 13 figures, 1 table

References in corpus (5)

• Two energy gaps and Fermi surface 'arcs' in NbSe2
• Pseudogap and charge density waves in two dimensions
• Fermi surface nesting in several transition metal dichalcogenides
• Temperature-dependent Fermi surface of 2H-TaSe2 driven by competing density wave order fluctuations
• Electronic structure and possible pseudogap behavior in iron based superconductors

Cited by in corpus (7)

• Emergence of coherence in the charge-density wave state of 2H-NbSe${}_2$
• Pseudogap from ARPES experiment: three gaps in cuprates and topological superconductivity
• Two-Dimensional TaSe2 Metallic Crystals: Spin-Orbit Scattering Length and Breakdown Current Density
• Light emission from the layered metal 2H-TaSe${}_2$ and its potential applications
• Probing a Bose Metal via Electrons: Inescapable non-Fermi liquid scattering and pseudogap physics
• Electron-phonon-dominated charge-density-wave fluctuations in TiSe${}_2$ accessed by ultrafast nonequilibrium dynamics
• Doping effects on charge density instability in non-centrosymmetric PbxTaSe2