[dmwg] [physics] Seminar {01}
IOP Scientific Activities
activity at iop.vast.ac.vn
Tue Nov 12 18:22:16 ICT 2013
VIỆN VẬT LÝ
INSTITUTE OF PHYSICS
---------------------------------------
SEMINAR
VẬT LÝ LÝ THUYẾT và VẬT LÝ TÍNH TOÁNTheoretical and
Computational Physics SeminarTiêu đề/Title:
Electronic structure and transportproperties in graphene and rotated
graphene bilayers
Người trình bày/Speaker:
TS.Guy Trambly de Laissardière
( Laboratoire de Physique Théorique et Modélisation
Université de Cergy-Pontoise / CNRS)
Thời gian/Time:
10g00, ThứBa, 19-11-2013
Địa điểm/Venue:
Phòng họp tầng 1, Viện Vật lý, 10 Đào Tấn, Ba Đình, Hà
Nội
Tóm tắt/abstractOn
electronic structure in rotated graphene bilayers, we address the long
lasting problem of the origin of the Moiré pattern observed on STM
images (for graphene multi layers and graphite). The general belief is
that the STM contrast in Moiré patterns is related to the difference in
the local density of states for different stacking regions. For large
and intermediated rotation angles, we present analytical and numerical
studies of the electronic structure which compare well to STM spectra.
For very small angles, this Moiré pattern ultimately leads to electronic
confinement in AA regions at some energies close to the Dirac point.
We propose a unified description of transport in
graphene with adsorbates that fully takes into account localization
effects and loss of electronic coherence due to inelastic processes. We
focus in particular on the role of the scattering properties of the
adsorbates and analyse in detail cases with resonant or non resonant
scattering. For both models we identify several regimes of conduction
depending on the value of the Fermi energy. Sufficiently far from the
Dirac energy and at sufficiently small concentrations the semi-classical
theory can be a good approximation. Near the Dirac energy we identify
different quantum regimes, where the conductivity presents universal
behaviours. Transport in rotated graphene bilayers is also discussed.
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