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Article: Electron dynamics in strained graphene
Title | Electron dynamics in strained graphene |
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Authors | |
Keywords | Graphene strain valley filtering pseudo-magnetic field scalar potential |
Issue Date | 2019 |
Publisher | World Scientific Publishing Co Pte Ltd. The Journal's web site is located at http://www.worldscinet.com/mplb/mplb.shtml |
Citation | Modern Physics Letters B, 2019, v. 33 n. 28, p. article no. 1930001 How to Cite? |
Abstract | This paper presents a theoretical description of the effects of strain induced by out-of-plane deformations on charge distributions and transport on graphene. A review of a continuum model for electrons using the Dirac formalism is complemented with elasticity theory to represent strain fields. The resulting model is cast in terms of scalar and pseudo-magnetic fields that control electron dynamics. Two distinct geometries, a bubble and a fold, are chosen to represent the most commonly observed deformations in experimental settings. It is shown that local charge accumulation regions appear in deformed areas, with a peculiar charge distribution that favors occupation of one sublattice only. This unique phenomenon that allows to distinguish each carbon atom in the unit cell, is the manifestation of a sublattice symmetry broken phase. For specific parameters, resonant states appear in localized charged regions, as shown by the emergence of discrete levels in band structure calculations. These findings are presented in terms of intuitive pictures that exploit analogies with confinement produced by square barriers. In addition, electron currents through strained regions are spatially separated into their valley components, making possible the manipulation of electrons with different valley indices. The degree of valley filtering (or polarization) for a specific system can be controlled by properly designing the strained area. The comparison between efficiencies of filters built with this type of geometries identifies extended deformations as better valley filters. A proposal for their experimental implementations as component of devices, and a discussion for potential observation of novel physics in strained structures are presented at the end of the paper. |
Persistent Identifier | http://hdl.handle.net/10722/279480 |
ISSN | 2023 Impact Factor: 1.8 2023 SCImago Journal Rankings: 0.334 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Zhai, D | - |
dc.contributor.author | Sandler, N | - |
dc.date.accessioned | 2019-11-01T07:18:11Z | - |
dc.date.available | 2019-11-01T07:18:11Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Modern Physics Letters B, 2019, v. 33 n. 28, p. article no. 1930001 | - |
dc.identifier.issn | 0217-9849 | - |
dc.identifier.uri | http://hdl.handle.net/10722/279480 | - |
dc.description.abstract | This paper presents a theoretical description of the effects of strain induced by out-of-plane deformations on charge distributions and transport on graphene. A review of a continuum model for electrons using the Dirac formalism is complemented with elasticity theory to represent strain fields. The resulting model is cast in terms of scalar and pseudo-magnetic fields that control electron dynamics. Two distinct geometries, a bubble and a fold, are chosen to represent the most commonly observed deformations in experimental settings. It is shown that local charge accumulation regions appear in deformed areas, with a peculiar charge distribution that favors occupation of one sublattice only. This unique phenomenon that allows to distinguish each carbon atom in the unit cell, is the manifestation of a sublattice symmetry broken phase. For specific parameters, resonant states appear in localized charged regions, as shown by the emergence of discrete levels in band structure calculations. These findings are presented in terms of intuitive pictures that exploit analogies with confinement produced by square barriers. In addition, electron currents through strained regions are spatially separated into their valley components, making possible the manipulation of electrons with different valley indices. The degree of valley filtering (or polarization) for a specific system can be controlled by properly designing the strained area. The comparison between efficiencies of filters built with this type of geometries identifies extended deformations as better valley filters. A proposal for their experimental implementations as component of devices, and a discussion for potential observation of novel physics in strained structures are presented at the end of the paper. | - |
dc.language | eng | - |
dc.publisher | World Scientific Publishing Co Pte Ltd. The Journal's web site is located at http://www.worldscinet.com/mplb/mplb.shtml | - |
dc.relation.ispartof | Modern Physics Letters B | - |
dc.rights | For preprints : Preprint of an article published in [Journal, Volume, Issue, Year, Pages] [Article DOI] © [copyright World Scientific Publishing Company] [Journal URL] For postprints : Electronic version of an article published as [Journal, Volume, Issue, Year, Pages] [Article DOI] © [copyright World Scientific Publishing Company] [Journal URL] | - |
dc.subject | Graphene | - |
dc.subject | strain | - |
dc.subject | valley filtering | - |
dc.subject | pseudo-magnetic field | - |
dc.subject | scalar potential | - |
dc.title | Electron dynamics in strained graphene | - |
dc.type | Article | - |
dc.identifier.email | Zhai, D: dzhai@hku.hk | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1142/S0217984919300011 | - |
dc.identifier.scopus | eid_2-s2.0-85072761812 | - |
dc.identifier.hkuros | 308517 | - |
dc.identifier.volume | 33 | - |
dc.identifier.issue | 28 | - |
dc.identifier.spage | article no. 1930001 | - |
dc.identifier.epage | article no. 1930001 | - |
dc.identifier.isi | WOS:000489888500001 | - |
dc.publisher.place | Singapore | - |
dc.identifier.issnl | 0217-9849 | - |