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Quantum oscillations with angular dependence in PdTe2single crystals.

Ramakanta Chapai1, D A Browne1, David E Graf2

  • 1Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, United States of America.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|October 20, 2020
PubMed
Summary
This summary is machine-generated.

Single crystalline palladium ditelluride (PdTe2) exhibits topological surface states and bulk Dirac points. Magnetic torque measurements reveal distinct de Haas-van Alphen oscillations, confirming its complex electronic structure and Berry phase properties.

Keywords:
Berry phaseLandau levelsde Haas–van Alphen oscillationstopological materials

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Topological Materials

Background:

  • Layered transition-metal dichalcogenide palladium ditelluride (PdTe2) is a material of interest.
  • PdTe2 possesses both bulk Dirac points and topological surface states.
  • Understanding the electronic properties of PdTe2 is crucial for exploring its potential applications.

Purpose of the Study:

  • To investigate the electronic properties of single crystalline PdTe2.
  • To characterize the topological surface states and bulk Dirac points.
  • To determine the Berry phase and effective masses of charge carriers in PdTe2.

Main Methods:

  • Magnetization and magnetic torque measurements up to 35 Tesla.
  • Analysis of de Haas-van Alphen (dHvA) oscillations.
  • Fitting data to the Lifshitz-Kosevich (LK) equation.
  • Hall effect measurements to confirm band structure.

Main Results:

  • Distinct dHvA oscillations were observed, indicating multiple electronic bands.
  • Eight frequencies were identified, with two dominant low frequencies (Fα = 8 T, Fβ = 117 T).
  • Effective masses (mα* = 0.059m0, mβ* = 0.067m0) and Berry phases (∼0.67π for α band, ∼0.23π-0.73π for β band) were determined.
  • Angular dependence studies revealed variations in frequency and Berry phase with field direction.

Conclusions:

  • The electronic band structure of PdTe2 is complex, featuring multiple bands.
  • The observed Berry phases are consistent with topological properties.
  • PdTe2 is a promising material for fundamental research in topological physics and potential spintronic applications.