期刊
PHYSICS LETTERS A
卷 377, 期 38, 页码 2628-2632出版社
ELSEVIER
DOI: 10.1016/j.physleta.2013.07.037
关键词
Silicene/BN moire superstructure; vdW interactions; First-principle calculations; Tunable band gap; High Fermi velocity
资金
- 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
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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