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2015 ; 5
(ä): 11512
Nephropedia Template TP
Sci Rep
2015[Jun]; 5
(ä): 11512
PMID26122870
show ga
Because of its novel physical properties, two-dimensional materials have
attracted great attention. From first-principle calculations and vibration
frequencies analysis, we predict a new family of two-dimensional materials based
on the idea of octet stability: honeycomb lattices of pnictogens (N, P, As, Sb,
Bi). The buckled structures of materials come from the sp(3) hybridization. These
materials have indirect band gap ranging from 0.43?eV to 3.7?eV. From the
analysis of projected density of states, we argue that the s and p orbitals
together are sufficient to describe the electronic structure under tight-binding
model, and the tight-binding parameters are obtained by fitting the band
structures to first-principle results. Surprisingly large on-site spin-orbit
coupling is found for all the pnictogen lattices except nitrogen. Investigation
on the electronic structures of both zigzag and armchair nanoribbons reveals the
possible existence of spin-polarized ferromagnetic edge states in some cases,
which are rare in one-dimensional systems. These edge states and magnetism may
exist under the condition of high vacuum and low temperature. This new family of
materials would have promising applications in electronics, optics, sensors, and
solar cells.