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Quasiparticle interference in unconventional 2D systems.

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  • 1Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

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|December 21, 2016
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Summary
This summary is machine-generated.

Investigating quasiparticle interference (QPI) in 2D materials like graphene and transition-metal dichalcogenides reveals exotic electronic properties. Fourier-transform scanning tunneling microscopy (FT-STM) is key to understanding these phenomena for future nanodevices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Two-dimensional (2D) systems, including graphene-like materials and transition-metal dichalcogenides (TMDs), exhibit unique electronic properties such as pseudospin chirality and spin-valley coupling.
  • These properties are of significant interest for potential applications in advanced nanodevices.
  • Quasiparticle interference (QPI) is a crucial phenomenon for probing these exotic electronic characteristics.

Purpose of the Study:

  • To review the investigation of QPI in 2D systems as a method to uncover their unconventional electronic properties.
  • To summarize key findings from QPI studies in graphene, silicene, and TMDs using Fourier-transform scanning tunneling microscopy/spectroscopy (FT-STM/STS).

Main Methods:

  • Introduction to 2D systems, their atomic structures, and electronic bands.
  • Explanation of Friedel oscillations and their relation to QPI.
  • Detailed description of Fourier-transform scanning tunneling microscopy/spectroscopy (FT-STM/STS) for resolving QPI patterns in reciprocal space.

Main Results:

  • QPI studies in graphene and silicene reveal intervalley and intravalley scattering, backscattering suppression, Dirac cones, and quasiparticle chirality.
  • FT-STM/STS investigations on monolayer and bilayer graphene on various substrates (SiC, metal surfaces) and silicene on Ag(111) are discussed.
  • QPI analysis in TMDs (WSe2) allows inference of spin texture and observation of spin-valley coupling through scattering channel analysis.

Conclusions:

  • QPI, particularly when studied with FT-STM/STS, is a powerful technique for characterizing the fundamental electronic properties of 2D materials.
  • The findings highlight the potential of graphene, silicene, and TMDs for future electronic applications due to their unique quantum mechanical behaviors.
  • Understanding QPI is essential for harnessing the spin and pseudospin properties of these advanced 2D materials.