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Disorder-Promoted Splitting in Quasiparticle Interference at Nesting Vectors.

V S Stolyarov1,2,3, V A Sheina2,4, D A Khokhlov2,3,5

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This summary is machine-generated.

Disorder in topological insulators like Bi2Te3 can surprisingly reveal electron lifetime via splitting of scattering vectors. This effect, observable with shorter quasiparticle lifetimes, offers a new measurement method.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Inelastic interactions typically degrade quantum coherence.
  • Disorder in systems like Friedel oscillations causes rapid amplitude decay.
  • Topological insulators possess unique electronic properties influenced by their structure.

Purpose of the Study:

  • To investigate the effect of disorder on coherent scattering in three-dimensional topological insulators.
  • To demonstrate a novel method for evaluating electron lifetimes using scattering vector splitting.
  • To explore the universality of this phenomenon in systems with well-defined scattering vectors.

Main Methods:

  • Experimental observation in bismuth telluride (Bi2Te3) thin films.
  • Theoretical modeling to explain the observed scattering vector splitting.
  • Analysis of quasiparticle lifetime dependence on disorder.

Main Results:

  • Observed nesting-induced splitting of coherent scattering vectors in Bi2Te3.
  • Demonstrated peculiar energy evolution of the splitting.
  • Established a correlation between splitting amplitude and electron lifetime.
  • Showed the effect is observable when quasiparticle lifetime shortens due to disorder.

Conclusions:

  • Disorder can induce observable splitting of coherent scattering vectors in topological insulators.
  • The amplitude of this splitting provides a quantitative measure of electron lifetime.
  • The phenomenon is expected in any system with a defined scattering vector, irrespective of topological properties.