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Dominant Charge Density Order in TaTe_{4}.

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|September 27, 2024
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This summary is machine-generated.

In transition metal tetratellurides TaTe4, charge density wave (CDW) order significantly alters electronic structure and transport. This CDW dominance creates unique electronic pockets, impacting quantum oscillations and superconductivity.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Physics

Background:

  • Electronic orders like charge density wave (CDW) and superconductivity drive exotic phenomena in materials.
  • Typically, CDW effects are minor, causing subtle band structure changes.
  • Transition metal chalcogenides and kagome superconductors showcase these phenomena.

Purpose of the Study:

  • To investigate the dominant role of CDW order in transition metal tetratellurides, specifically TaTe4.
  • To understand how CDW impacts the electronic structure and transport properties of TaTe4.
  • To explore the interplay of CDW, superconductivity, and topological states.

Main Methods:

  • Angle-resolved photoemission spectroscopy (ARPES) to probe band structure.
  • Density functional theory (DFT) calculations to analyze CDW origin.
  • Quantum oscillation measurements (magnetoresistance) to detect electronic pockets.

Main Results:

  • TaTe4 exhibits small, bulk electron pockets originating from CDW-induced band folding.
  • ARPES, DFT, and quantum oscillation data show strong agreement on pocket characteristics.
  • CDW order profoundly influences the electronic landscape, unlike in typical materials.

Conclusions:

  • Transition metal tetratellurides like TaTe4 are exceptional systems for studying strong CDW effects.
  • The CDW-induced pockets are crucial for understanding transport and potential superconductivity.
  • TaTe4 offers a platform for exploring CDW, pressure-induced superconductivity, and topological states.