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Adsorption Isotherms II01:25

Adsorption Isotherms II

Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...

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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Stabilizing topological phases in graphene via random adsorption.

Hua Jiang1, Zhenhua Qiao, Haiwen Liu

  • 1International Center for Quantum Materials, Peking University, Beijing 100871, China.

Physical Review Letters
|September 26, 2012
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Randomizing adatom distribution in graphene can induce topological phases. This approach weakens intervalley scattering, transforming graphene from a trivial insulator into a topological state, crucial for advanced electronic applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Chemistry

Background:

  • Graphene exhibits topological phases when subjected to periodic adatoms, influenced by spin-orbit couplings.
  • Intervalley scattering at specific adatom coverages can lead to trivial insulating states in graphene.

Purpose of the Study:

  • To investigate the realization of topological phases in graphene with randomly distributed adsorbates.
  • To understand how adatom distribution impacts topological properties and scattering mechanisms.

Main Methods:

  • Finite-size scaling approach.
  • Landauer-Büttiker formula for transport calculations.

Main Results:

  • Random adatom distribution significantly weakens intervalley scattering.
  • Spin-orbit couplings are negligibly affected by adatom distribution randomization.
  • Graphene transitions from a trivial insulator to a topological state due to randomized adatom distribution.

Conclusions:

  • Randomizing adatom distribution is a viable strategy to achieve topological states in graphene.
  • This method offers a pathway to engineer graphene's electronic properties for novel applications.