# Detailed Electronic Structure of the Three-Dimensional Fermi Surface and its Sensitivity to Charge Density Wave Transition in ZrTe3 Revealed by High Resolution Laser-Based Angle-Resolved Photoemission Spectroscopy

## TL;DR

This study uses high-resolution laser ARPES to reveal the detailed 3D electronic structure of ZrTe3, showing its sensitivity to the charge density wave transition and its implications for understanding CDW and superconductivity.

## Contribution

The paper provides the first detailed 3D Fermi surface mapping of ZrTe3 and links its temperature-dependent changes to the charge density wave transition.

## Key findings

- 3D Fermi surface shows a pronounced shrinking with temperature
- Quasiparticle scattering rate exhibits an anomaly near the CDW transition temperature
- Weak electron-phonon coupling signature observed at ~20 meV

## Abstract

The detailed information of the electronic structure is the key for understanding the nature of charge density wave (CDW) order and its relationship with superconducting order in microscopic level. In this paper, we present high resolution laser-based angle-resolved photoemission spectroscopy (ARPES) study on the three-dimensional (3D) hole-like Fermi surface around the Brillouin zone center in a prototypical qusi-one-dimensional CDW and superconducting system ZrTe3. Double Fermi surface sheets are clearly resolved for the 3D hole-like Fermi surface around the zone center. The 3D Fermi surface shows a pronounced shrinking with increasing temperature. In particular, the quasiparticle scattering rate along the 3D Fermi surface experiences an anomaly near the charge density wave transition temperature of ZrTe3 (~63 K). Signature of electron-phonon coupling is observed with a dispersion kink at ~20 meV; the strength of the electron-phonon coupling around the 3D Fermi surface is rather weak. These results indicate that the 3D Fermi surface is also closely connected to the charge-density-wave transition and suggest a more global impact on the entire electronic structure induced by CDW phase transition in ZrTe3.