Classification of Charge Density Waves Based on Their Nature

Abstract

The concept of a Charge Density Wave (CDW) permeates much of condensed matter physics and chemistry. Conceptually, CDWs have their origin rooted in the instability of a one-dimensional system described by Peierls. The extension of this concept to reduced dimensional systems has led to the concept of Fermi surface nesting (FSN), which dictates the wave vector q_cdw of the CDW and the corresponding lattice distortion. The idea is that segments of the Fermi contours are connected by q_cdw, resulting in the effective screening of phonons inducing Kohn Anomalies in their dispersion at q_cdw, driving a lattice restructuring at low temperatures. There is growing theoretical and experimental evidence that this picture fails in many real systems and in fact it is the momentum dependence of the electron-phonon coupling (EPC) matrix element that determines the characteristic of CDW phase (q_cdw). Here, based on the published results for the prototypical CDW system 2H-NbSe2, we show how well the q-dependent EPC matrix element, but not the FSN, can describe the origin of CDW. We further demonstrate a procedure of combing electronic band and phonon (dispersion and linewidth) measurements to extract the EPC matrix element, allowing the electronic states involved in the EPC to be identified. Thus we show that a large EPC does not necessarily induce the CDW phase, with Bi2Sr2CaCu2O8 (Bi2212) as the example, and the charge ordered phenomena observed in various cuprates are not driven by FSN or EPC. To experimentally resolve the microscopic picture of EPC will lead to a fundamental change in the way we think about, write about, and classify Charge Density Waves.

References in corpus (10)

• Direct observation of competition between superconductivity and charge density wave order in YBa2Cu3Oy
• Fermi surface nesting and the origin of Charge Density Waves in metals
• Charge density wave origin of cuprate checkerboard visualized by scanning tunneling microscopy
• Direct phase-sensitive identification of a d-form factor density wave in underdoped cuprates
• X-ray diffraction observation of charge density wave order at zero magnetic field in ortho-II YBa${}_2$Cu${}_3$O${}_{6.54}$
• Two energy gaps and Fermi surface 'arcs' in NbSe2
• Pseudogap and charge density waves in two dimensions
• Quasi-Particle Spectra, Charge-Density-Wave, Superconductivity and Electron-Phonon Coupling in 2H-NbSe2
• A quantum phase transition from triangular to stripe charge order in NbSe${}_2$
• Fermi surface nesting in several transition metal dichalcogenides

Cited by in corpus (10)

• The low-temperature highly correlated quantum phase in the charge-density-wave 1T-TaS_2 compound
• Electron-phonon coupling and the Coexistence of Superconductivity and Charge-Density Wave in Monolayer NbSe2
• Ultrafast electron calorimetry uncovers a new long-lived metastable state in 1T-TaSe${}_2$ mediated by mode-selective electron-phonon coupling
• Strain Engineering a $4a\times \sqrt{3}a$ Charge Density Wave Phase in Transition Metal Dichalcogenide 1T-VSe${}_2$
• Incommensurate phonon anomaly and the nature of charge density waves in cuprates
• Yu-Shiba-Rusinov states of impurities in a triangular lattice of NbSe${}_2$ with spin orbit coupling
• Novel Superstructure-Phase Two-Dimensional Material 1$\text{T}$-VSe${}_2$ at High Pressure
• Soft phonon driven orbital order in CaMn7O12
• Possible Lattice and Charge Order in CuxBi2Te2Se
• Phenomenological approach of the thermodynamic properties of CDW (SDW) systems