Role of the trigonal warping on the minimal conductivity of bilayer graphene
Megjelenés dátuma: 2007
MTMT: 1205030
WoS ID: 000248664700046
Scopus ID: 34547883124
PubMed ID: 17930851
Absztrakt:
Using a reformulated Kubo formula we calculate the zero-energy minimal
conductivity of bilayer graphene taking into account the small but
finite trigonal warping. We find that the conductivity is independent
of the strength of the trigonal warping and it is 3 times as large as
that without trigonal warping and 6 times larger than that in single
layer graphene. Although the trigonal warping of the dispersion
relation around the valleys in the Brillouin zone is effective only for
low-energy excitations, our result shows that its role cannot be
neglected in the zero-energy minimal conductivity.
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