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Anderson Localization in a Two-Dimensional Metal.

Morgan Thinel1,2, Taketo Handa1, Christie S Koay1

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Anderson localization, crucial for superconductivity and quantum effects, is enhanced in 2D materials. This study demonstrates electron and phonon localization in monolayer Pd_{5}AlI_{2} using scanning tunneling spectroscopy.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Anderson localization is key to superconductivity, thermoelectricity, and the quantum anomalous Hall effect.
  • Dimensionality significantly influences Anderson localization phenomena.
  • Previous studies on 2D conductors faced challenges like domain size effects and grain boundaries.

Purpose of the Study:

  • Investigate Anderson localization in a 2D van der Waals metal, Pd_{5}AlI_{2}.
  • Overcome limitations of traditional thin film deposition methods.
  • Provide spectroscopic evidence for electron and phonon localization at reduced dimensionality.

Main Methods:

  • Utilized scanning tunneling spectroscopy (STS).
  • Analyzed monolayer and multilayer Pd_{5}AlI_{2} samples.
  • Examined density of states and phonon modes.

Main Results:

  • Demonstrated Anderson localization of electrons in monolayer Pd_{5}AlI_{2} via a Coulomb gap and unique density of states.
  • Observed phonon localization, evidenced by layer-dependent phonon mode broadening and softening.
  • Found these localization signatures absent in multilayer samples.

Conclusions:

  • Spectroscopic evidence confirms electron and phonon localization in 2D Pd_{5}AlI_{2}.
  • Localization effects are enhanced at reduced dimensionality, supporting theoretical predictions.
  • Pd_{5}AlI_{2} offers a novel platform for studying localization physics in 2D systems.