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Pseudogap and charge density waves in two dimensions.

S V Borisenko1, A A Kordyuk, A N Yaresko

  • 1Leibniz-Institute for Solid State Research, IFW-Dresden, Dresden, Germany.

Physical Review Letters
|June 4, 2008
PubMed
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A normal-state pseudogap exists above the incommensurate charge-density wave transition in 2H-TaSe(2). This pseudogap, driven by nesting instability, resembles those found in superconducting cuprates.

Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Two-dimensional (2D) materials like 2H-TaSe(2) exhibit complex electronic phases.
  • Charge-density waves (CDWs) are a key phenomenon in these materials, influencing their properties.

Purpose of the Study:

  • To investigate the electronic properties of 2H-TaSe(2) above the incommensurate CDW transition temperature (T(N-IC)).
  • To identify the presence and characteristics of a normal-state pseudogap in this material.

Main Methods:

  • Angle-resolved photoemission spectroscopy (ARPES) was employed to probe the electronic structure.
  • Analysis focused on the electronic band structure and its modifications around the CDW transition.

Main Results:

  • A normal-state pseudogap was observed above T(N-IC) in 2H-TaSe(2).

Related Experiment Videos

  • The formation of the incommensurate CDW was confirmed to be driven by a conventional nesting instability, evidenced by this pseudogap.
  • The 2D-CDW pseudogap exhibits similarities in magnitude, character, and anisotropy to those observed in superconducting cuprates.

    • Conclusions:

    • The study confirms the existence of a normal-state pseudogap in 2H-TaSe(2) preceding the CDW formation.
    • These findings suggest a potential link between CDW physics and phenomena observed in high-temperature superconductors.