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Probing Berry Phase Effect in Topological Surface States.

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Researchers observed the Berry phase effect in topological surface states using spectroscopy. This geometric phase influences electron behavior, offering new ways to control electron spin with light in quantum materials.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Optics
  • Materials Science

Background:

  • Topological surface states (TSSs) exhibit unique electronic properties due to strong spin-orbit coupling.
  • The Berry phase is a geometric quantum phase that influences the dynamics of particles in electronic bands.
  • Controlling electron spin with light is crucial for developing advanced quantum technologies.

Purpose of the Study:

  • To experimentally observe and characterize the Berry phase effect in TSSs.
  • To investigate the influence of interband coherence on Berry phase accumulation.
  • To explore the potential of lightwave control over electron spin in quantum materials.

Main Methods:

  • Utilized two-color high-harmonic spectroscopy to probe TSSs.
  • Introduced a secondary weak field to perturb Dirac fermion dynamics.
  • Analyzed spectral interferograms to detect phase shifts in even-order harmonics.

Main Results:

  • Observed a significant phase shift in even-order harmonics, confirming Berry phase accumulation.
  • Linked the observed modulation to the geometric phase acquired during nonperturbative dynamics.
  • Demonstrated that the Berry phase significantly deforms quantum paths of electron-hole pairs.

Conclusions:

  • The Berry phase effect in TSSs can be accessed and manipulated using tailored light fields.
  • This phenomenon provides a novel pathway for lightwave-driven control of electron spin.
  • Highlights the potential of using quantum materials with strong spin-orbit interactions for advanced spintronic applications.