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Berry-Phase Switch in Electrostatically Confined Topological Surface States.

Jun Zhang1, Ye-Ping Jiang1, Xu-Cun Ma2,3

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Researchers visualized topological surface states in antimony telluride films. These states exhibit field-induced splitting, demonstrating a Berry-phase switch crucial for quantum device development.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Physics

Background:

  • Topological insulators (TIs) possess unique surface states with potential for quantum computing.
  • Controlling these surface states is key to developing novel TI-based quantum devices.

Purpose of the Study:

  • To visualize and understand the trapping of topological surface states in specific TI structures.
  • To investigate the behavior of these trapped states under varying magnetic fields.
  • To confirm the role of the Berry phase in observed phenomena.

Main Methods:

  • Fabrication of seven-quintuple-layer 3D topological insulator Sb2Te3 epitaxial films.
  • Creation of circular n-p junctions on the TI surface.
  • Spatially and field-dependent tunneling spectroscopy.
  • Numerical and semiclassical simulations for data comparison.

Main Results:

  • Successful electrostatic trapping of topological surface states was achieved.
  • Observed field-induced splitting of degenerate states at zero magnetic field.
  • Experimental data unambiguously matched simulations, confirming a Berry-phase switch.

Conclusions:

  • The study demonstrates the electrostatic trapping of topological surface states in Sb2Te3 films.
  • The observation of Berry-phase switch opens avenues for TI-based quantum device applications.
  • This work provides a platform for exploring new quantum phenomena in topological materials.