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- Publisher Website: 10.1021/acs.nanolett.6b04870
- Scopus: eid_2-s2.0-85017538601
- PMID: 28211276
- WOS: WOS:000399354500020
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Article: Tuning the Pseudospin Polarization of Graphene by a Pseudomagnetic Field
Title | Tuning the Pseudospin Polarization of Graphene by a Pseudomagnetic Field |
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Authors | Georgi, AlexanderNemes-Incze, PeterCarrillo-Bastos, RamonFaria, DaiaraViola Kusminskiy, SilviaZhai, DaweiSchneider, MartinSubramaniam, DineshMashoff, TorgeFreitag, Nils M.Liebmann, MarcusPratzer, MarcoWirtz, LudgerWoods, Colin R.Gorbachev, Roman V.Cao, YangNovoselov, Kostya S.Sandler, NancyMorgenstern, Markus |
Keywords | Graphene pseudomagnetic field pseudospin polarization STM strain valley filter |
Issue Date | 2017 |
Citation | Nano Letters, 2017, v. 17, n. 4, p. 2240-2245 How to Cite? |
Abstract | 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. |
Persistent Identifier | http://hdl.handle.net/10722/335286 |
ISSN | 2023 Impact Factor: 9.6 2023 SCImago Journal Rankings: 3.411 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Georgi, Alexander | - |
dc.contributor.author | Nemes-Incze, Peter | - |
dc.contributor.author | Carrillo-Bastos, Ramon | - |
dc.contributor.author | Faria, Daiara | - |
dc.contributor.author | Viola Kusminskiy, Silvia | - |
dc.contributor.author | Zhai, Dawei | - |
dc.contributor.author | Schneider, Martin | - |
dc.contributor.author | Subramaniam, Dinesh | - |
dc.contributor.author | Mashoff, Torge | - |
dc.contributor.author | Freitag, Nils M. | - |
dc.contributor.author | Liebmann, Marcus | - |
dc.contributor.author | Pratzer, Marco | - |
dc.contributor.author | Wirtz, Ludger | - |
dc.contributor.author | Woods, Colin R. | - |
dc.contributor.author | Gorbachev, Roman V. | - |
dc.contributor.author | Cao, Yang | - |
dc.contributor.author | Novoselov, Kostya S. | - |
dc.contributor.author | Sandler, Nancy | - |
dc.contributor.author | Morgenstern, Markus | - |
dc.date.accessioned | 2023-11-17T08:24:36Z | - |
dc.date.available | 2023-11-17T08:24:36Z | - |
dc.date.issued | 2017 | - |
dc.identifier.citation | Nano Letters, 2017, v. 17, n. 4, p. 2240-2245 | - |
dc.identifier.issn | 1530-6984 | - |
dc.identifier.uri | http://hdl.handle.net/10722/335286 | - |
dc.description.abstract | 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. | - |
dc.language | eng | - |
dc.relation.ispartof | Nano Letters | - |
dc.subject | Graphene | - |
dc.subject | pseudomagnetic field | - |
dc.subject | pseudospin polarization | - |
dc.subject | STM | - |
dc.subject | strain | - |
dc.subject | valley filter | - |
dc.title | Tuning the Pseudospin Polarization of Graphene by a Pseudomagnetic Field | - |
dc.type | Article | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1021/acs.nanolett.6b04870 | - |
dc.identifier.pmid | 28211276 | - |
dc.identifier.scopus | eid_2-s2.0-85017538601 | - |
dc.identifier.volume | 17 | - |
dc.identifier.issue | 4 | - |
dc.identifier.spage | 2240 | - |
dc.identifier.epage | 2245 | - |
dc.identifier.eissn | 1530-6992 | - |
dc.identifier.isi | WOS:000399354500020 | - |