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Two-Dimensional Conical Dispersion in ZrTe_{5} Evidenced by Optical Spectroscopy.

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This summary is machine-generated.

Zirconium pentatelluride (ZrTe5) is not a 3D Dirac semimetal as previously thought. Its electronic band structure shows linear dispersion in one plane but parabolic in another, challenging existing models.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Physics

Background:

  • Zirconium pentatelluride (ZrTe5) was recently proposed as a 3D Dirac semimetal.
  • This classification was based on a single conical band at the Brillouin zone center.
  • The lack of symmetry protection for this band raised questions about potential band gap opening and topological properties.

Purpose of the Study:

  • To investigate the electronic band structure of ZrTe5.
  • To determine if Zr5Te5 behaves as a 3D Dirac semimetal.
  • To clarify the nature of electronic states and band dispersion in ZrTe5.

Main Methods:

  • Combined experimental study using optical and transport measurements.
  • Analysis of electronic band dispersion in ZrTe5.

Main Results:

  • The electronic band dispersion in ZrTe5 is approximately linear only in the a-c plane.
  • The band dispersion is relatively flat and parabolic along the b axis.
  • A band gap of 2Δ=6 meV was observed at low temperatures.

Conclusions:

  • The electronic states in ZrTe5 cannot be described by the 3D Dirac massless electron model.
  • The observed band structure deviates from the predictions for a 3D Dirac semimetal.
  • ZrTe5 exhibits anisotropic electronic properties, with distinct dispersion characteristics along different crystallographic axes.