Nano Archive

Graphene-like bilayer hexagonal silicon polymorph

Bai, Jaeil and Tanaka, Hideki and Zeng, Xiao Cheng (2010) Graphene-like bilayer hexagonal silicon polymorph. Nano Research, 3 (10). pp. 694-700.


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We present molecular dynamics simulation evidence for a freezing transition from liquid silicon to quasi-two-dimensional (quasi-2D) bilayer silicon in a slit nanopore. This new quasi-2D polymorph of silicon exhibits a bilayer hexagonal structure in which the covalent coordination number of every silicon atom is four. Quantum molecular dynamics simulations show that the stand-alone bilayer silicon (without the confinement) is still stable at 400 K. Electronic band-structure calculations suggest that the bilayer hexagonal silicon is a quasi-2D semimetal, similar to a graphene monolayer, but with an indirect zero band gap.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:9880
Deposited By:JNCASR
Deposited On:26 Nov 2010 05:40
Last Modified:26 Nov 2010 05:40

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