Is the dispersion anomaly of the electron spectrum induced by the charge-density-wave in high-$T_c$ superconductors?

TL;DR

This paper suggests that a symmetric charge density wave causes the unusual electron dispersion observed in high-temperature superconductors, aligning well with experimental ARPES and STM data.

Contribution

It demonstrates that a 4-lattice constant charge density wave explains the dispersion anomaly in high-$T_c$ superconductors, providing a theoretical link to experimental observations.

Findings

Nodal quasiparticle is well-defined at low energies.

Dispersion breaks at energy E_1 and reappears at E_2.

Results agree with ARPES and STM experiments.

Abstract

We propose that the presence of a rotationally symmetric charge density wave (CDW) with the modulation of 4-lattice constant in high-$T_c$ superconductors is essentially responsible for an anomalous quasiparticle dispersion revealed recently by angle-resolved photoemission spectroscopy (ARPES) experiments. We elaborate clearly that the nodal quasiparticle is well-defined at low energies, while the dispersion breaks up at the energy $E_1$ and reappears at the energy $E_2$. Our results are in good agreement with both the ARPES and scanning tunneling microscopy experiments.