Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.116803
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Funding
- China Postdoctroal Science Foundation [20100480147, 201104030]
- MOST Project of China [2012CB-921300]
- NSFC [91121004]
- Welch Foundation [F-1255]
- DOE, Division of Materials Science and Engineering [DE-FG03-02ER45958]
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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-Buttiker 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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