Journal
PHYSICS LETTERS A
Volume 377, Issue 38, Pages 2628-2632Publisher
ELSEVIER
DOI: 10.1016/j.physleta.2013.07.037
Keywords
Silicene/BN moire superstructure; vdW interactions; First-principle calculations; Tunable band gap; High Fermi velocity
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Funding
- National Basic Research Program of China [2012CB932302]
- National Natural Science Foundation of China [91221101]
- Natural Science Fund for Distinguished Young Scholars of Shandong Province [JQ201001]
- National Super Computing Centre in Jinan
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Using first-principles calculations, we predicted hexagonal boron nitride (h-BN) with flat surface is an ideal substrate for silicene. Van der Waals interactions hold silicene and h-BN together, forming silicene/BN moire superstructures. The moire superstructures open a band gap of about 30 meV at the Dirac point of silicene at equilibrium distance. The band gap is almost independent of the rotation angle between the two lattices, but can be effectively tuned by changing the interlayer spacing. The high Fermi velocity of silicene is well preserved in these superstructures. These features are helpful in achieving applications of silicene in nanoscale electronic devices. (C) 2013 Elsevier B.V. All rights reserved.
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