Peierls-Type Instability and Tunable Band Gap in Functionalized Graphene

被引:56
作者
Abanin, D. A. [1 ,2 ]
Shytov, A. V. [3 ]
Levitov, L. S. [4 ]
机构
[1] Princeton Univ, Princeton Ctr Theoret Sci, Princeton, NJ 08544 USA
[2] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA
[3] Univ Exeter, Dept Phys, Exeter EX4 4QL, Devon, England
[4] MIT, Dept Phys, Cambridge, MA 02139 USA
关键词
EPITAXIAL GRAPHENE; BILAYER GRAPHENE; ADATOMS; DEVICES;
D O I
10.1103/PhysRevLett.105.086802
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Functionalizing graphene was recently shown to have a dramatic effect on the electronic properties of this material. Here we investigate spatial ordering of adatoms driven by the RKKY-type interactions. In the ordered state, which arises via a Peierls-instability-type mechanism, the adatoms reside mainly on one of the two graphene sublattices. Bragg scattering of electron waves induced by sublattice symmetry breaking results in a band gap opening, whereby Dirac fermions acquire a finite mass. The band gap is found to be immune to the adatoms' positional disorder, with only an exponentially small number of localized states residing in the gap. The gapped state is stabilized in a wide range of electron doping. Our findings show that controlled adsorption of adatoms or molecules provides a route to engineering a tunable band gap in graphene.
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页数:4
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