| Issue |
EPL
Volume 87, Number 5, September 2009
|
|
|---|---|---|
| Article Number | 57002 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/87/57002 | |
| Published online | 16 September 2009 | |
Time evolution of charge conductivity of graphene bilayers
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University Nanjing 210093, China
Received:
11
May
2009
Accepted:
18
August
2009
We adopt the dynamical method developed to solve the charge
transport properties in monolayer graphene system (Lewkowicz M. and Rosenstein B., Phys. Rev. Lett., 102 (2009) 106802) to bilayer graphene. We calculate the energy and
the current density evolving with time when an electron field is applied to the system at time 
. The conductivity shows a
rapid oscillation at the beginning (small t), but soon converges
to a steady value 
which coincides with the optical conductivity study value. We suggest that the physical
origin of the minimum conductivity can be rooted to the electron-hole pairs excited by the electron field and the coherent transport.
PACS: 73.21.Ac – Multilayers / 73.23.Ad – Ballistic transport / 81.05.Uw – Carbon, diamond, graphite
© EPLA, 2009
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