Abstract
The formation of atomic nanoclusters on suspended graphene sheets has beeninvestigated by employing a molecular dynamics simulation at finite temperature. Oursystematic study is based on temperature-dependent molecular dynamics simulations ofsome transition and alkali atoms on suspended graphene sheets. We find thatthe transition atoms aggregate and make various size nanoclusters distributedrandomly on graphene surfaces. We also report that most alkali atoms make oneatomic layer on graphene sheets. Interestingly, the potassium atoms almost depositregularly on the surface at low temperature. We expect from this behavior that theelectrical conductivity of a suspended graphene doped by potassium atoms would bemuch higher than in the case doped by the other atoms at low temperature.
Highlights
Graphene is a newly realized two-dimensional electron system [1, 2] which has produced a great deal of interest because of the new physics which it exhibits and because of its potential as a new material for electronic technology
We have considered a system incorporating the transition atoms like copper, silver and gold atoms or the alkali atoms like lithium, sodium and potassium atoms on graphene sheets
We have studied the formation of atomic nanoclusters on suspended graphene sheets by using a Molecular dynamics simulation at finite temperature
Summary
Graphene is a newly realized two-dimensional electron system [1, 2] which has produced a great deal of interest because of the new physics which it exhibits and because of its potential as a new material for electronic technology. [10, 11] Suzuura and Ando [10] claimed that the quantum correction to the conductivity in graphene can differ from what is observed in normal two-dimensional electron gas due to the nature of elastic scattering in graphene. This is possibly because of changing the sign of the localization correction and turn weak localization into weak antilocalization for the region when intervalley scattering time is much larger than the phase coherence time. Further consideration of the behavior of the quantum correction to the conductivity in graphene [11] conclude that this behavior is entirely suppressed due to time-reversal symmetry breaking of electronic states around each degenerate valley
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