| 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  [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 | |
| 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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