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 ![]() | |
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 | |
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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