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Intrinsic surface dipole in topological insulators.

Benjamin M Fregoso1, Sinisa Coh

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|October 7, 2015
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Summary
This summary is machine-generated.

Topological insulators like Bi2Se3 exhibit a surface dipole and band bending due to surface state occupation. This suggests topological insulators function as intrinsic Schottky barrier solar cells.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Physics

Background:

  • Topological insulators possess unique surface states with potential electronic applications.
  • Understanding surface electronic properties is crucial for device development.

Purpose of the Study:

  • To investigate the local density of states and surface electronic properties of topological insulators.
  • To determine the origin and consequences of surface electronic phenomena in pristine topological insulators.

Main Methods:

  • Utilizing density functional theory (DFT) calculations.
  • Analyzing the local density of states as a function of distance from the surface.

Main Results:

  • A 2 nm thick surface dipole was identified in Bi2Se3 and Bi2Te2Se, arising from the occupation of topological surface states above the Dirac point.
  • Upward band bending of approximately 75 meV was observed in the conduction band near the surface.
  • A distinct hump-like feature was found at the top of the valence band.

Conclusions:

  • Pristine topological insulators exhibit intrinsic band bending when the Fermi level does not cross the Dirac point.
  • The observed phenomena suggest that topological insulators can function as intrinsic Schottky barrier solar cells.