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Phys Rev Lett. 2012 Sep 14;109(11):116803. Epub 2012 Sep 11.

Stabilizing topological phases in graphene via random adsorption.

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


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├╝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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