Stabilizing topological phases in graphene via random adsorption

Details Stabilizing topological phases in graphene via random adsorption Stabilizing topological phases in graphene via random adsorption

2012-04-15

arxiv.org/abs/1204.3276v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages and 3 figures

Scientific paper

We study the possibility of realizing topological phases in graphene with randomly distributed adsorbates. When graphene is subjected to periodically distributed adatoms, the enhanced spin-orbit couplings can result in various topological phases. However, at certain adatom coverages, the intervalley scattering renders the system a trivial insulator. By employing a finite-size scaling approach and Landauer-B\"{u}ttiker formula, we show that the randomization of adatom distribution greatly weakens the intervalley scattering, but plays a negligible role in spin-orbit couplings. Consequently, such a randomization turns graphene from a trivial insulator into a topological state.

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