Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: K1.00256 : Trigonal Distortion of Valley Current in Bilayer Graphene
Author:
Bilayer Graphene (BLG) is extensively explored due to its remarkably
electronic properties. Its band structure has two inequivalent but
degenerate points K and K' at the corners of the Brillouin Zone,
because
their large separation there have been proposition to use a
valley index, or
pseudospin to generate valley dependent currents. In BLG these
currents can
be created by applying an step like bias, the topology of BLG in
the two
zones leads to the formation of a 1D chiral zero modes transverse
to the
applied bias. There are two such modes per spin per valley and
the current
have opposite direction in each valley. We explore how the
trigonal warping
of BLG affects these modes. Breaking the symmetry of the unit
cell in BLG
opens a gap, the shape of the Berry Curvature depends of the bias
applied,
for very low bias (few meV) the topological charge breaks in four
well
defined peaks, three having the same sign and magnitude and the
fourth with
opposite value, the overall charge remains unaltered, these
fraction charges
lead to a distortion of the chiral zero modes. We calculate the
currents and
show how the system evolves by tuning the effect of the trigonal
warping.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.K1.256
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