Reference : Tuning the Pseudospin Polarization of Graphene by a Pseudomagnetic Field
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
http://hdl.handle.net/10993/34359
Tuning the Pseudospin Polarization of Graphene by a Pseudomagnetic Field
English
Georgi, Alexander [RWTH Aachen University > II. Institute of Physics B]
Nemes-Incze, Peter [RWTH Aachen University > II. Institute of Physics B]
Carrillo-Bastos, Ramon [Universidad Autónoma de Baja California > Facultad de Ciencias]
Faria, Daiara [Universidade Federal Fluminense, Niterói, Rio de Janeiro > Instituto de Física]
Kusminskiy, Silvia Viola [Freie Universität Berlin]
Zhai, Dawei [Ohio University, Athens, Ohio > Department of Physics and Astronomy]
Schneider, Martin [Freie Universität Berlin]
Subramaniam, Dinesh [RWTH Aachen University > II. Institute of Physics B]
Mashoff, Torge [Johannes Gutenberg-Universität Mainz]
Freitag, Nils M. [RWTH Aachen University > II. Institute of Physics B]
Liebmann, Marcus [RWTH Aachen University > II. Institute of Physics B]
Pratzer, Marco [RWTH Aachen University > II. Institute of Physics B]
Wirtz, Ludger mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit >]
Woods, Colin R. [University of Manchester > School of Physics and Astronomy]
Gorbachev, Roman V. [University of Manchester > School of Physics and Astronomy]
Cao, Yang [University of Manchester > School of Physics and Astronomy]
Novoselov, Kostya S. [University of Manchester > School of Physics and Astronomy]
Sandler, Nancy [Ohio University, Athens, Ohio > Department of Physics and Astronomy]
Morgenstern, Markus [RWTH Aachen University > II. Institute of Physics B]
17-Feb-2017
Nano Letters
American Chemical Society
17
2240−2245
Yes (verified by ORBilu)
International
1530-6984
1530-6992
Washington
DC
[en] graphene ; STM ; strain ; pseudomagnetic field ; pseudospin polarization ; valley filter
[en] One of the intriguing characteristics of honeycomb
lattices is the appearance of a pseudomagnetic field as a result of
mechanical deformation. In the case of graphene, the Landau
quantization resulting from this pseudomagnetic field has been
measured using scanning tunneling microscopy. Here we show that a
signature of the pseudomagnetic field is a local sublattice symmetry
breaking observable as a redistribution of the local density of states.
This can be interpreted as a polarization of graphene’s pseudospin due
to a strain induced pseudomagnetic field, in analogy to the alignment
of a real spin in a magnetic field. We reveal this sublattice symmetry
breaking by tunably straining graphene using the tip of a scanning
tunneling microscope. The tip locally lifts the graphene membrane
from a SiO2 support, as visible by an increased slope of the I(z)
curves. The amount of lifting is consistent with molecular dynamics
calculations, which reveal a deformed graphene area under the tip in the shape of a Gaussian. The pseudomagnetic field induced by the deformation becomes visible as a sublattice symmetry breaking which scales with the lifting height of the strained deformation and therefore with the pseudomagnetic field strength. Its magnitude is quantitatively reproduced by analytic and tight-binding models, revealing fields of 1000 T. These results might be the starting point for an effective THz valley filter, as a basic element of valleytronics.
Researchers ; Professionals ; Students
http://hdl.handle.net/10993/34359
10.1021/acs.nanolett.6b04870
FnR ; FNR7490149 > Ludger Wirtz > NANOTMD > 20 Electric Transport And Superconductivity In TransitionMetal Dichalcogenides Nanolayers > 01/02/2014 > 31/01/2019 > 2013

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