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Article: Switchable valley functionalities of an n − n− − n junction in 2D crystals
Title | Switchable valley functionalities of an n − n− − n junction in 2D crystals |
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Authors | |
Keywords | 2D materials Lateral junction Valleytronics |
Issue Date | 2017 |
Publisher | Institute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2053-1583/ |
Citation | 2D Materials, 2017, v. 4 n. 2, p. 025109 How to Cite? |
Abstract | We show that an n − n− − n junction in 2D crystals can flexibly realize two basic valleytronic functions, i.e. valley filter and valley source, with gate controlled switchability between the two. Upon carrier flux passing through the junction, the valley filter and valley source functions are enabled respectively by intra- and inter-valley scatterings, and the two functions dominate respectively at small and large band-offset between the n and n− regions. It can be generally shown that, the valley filter effect has an angular dependent polarity and vanishes under angular integration, by the same constraint from time-reversal symmetry that leads to its absence in one dimension. These findings are demonstrated for monolayer transition metal dichalcogenides and graphene using tight-binding calculations. We further show that junction along chiral directions can concentrate the valley pump in an angular interval largely separated from the bias direction, allowing efficient havest of valley polarization in a cross-bar device. |
Persistent Identifier | http://hdl.handle.net/10722/242260 |
ISSN | 2023 Impact Factor: 4.5 2023 SCImago Journal Rankings: 1.483 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Tu, W | - |
dc.contributor.author | Yao, W | - |
dc.date.accessioned | 2017-07-24T01:37:25Z | - |
dc.date.available | 2017-07-24T01:37:25Z | - |
dc.date.issued | 2017 | - |
dc.identifier.citation | 2D Materials, 2017, v. 4 n. 2, p. 025109 | - |
dc.identifier.issn | 2053-1583 | - |
dc.identifier.uri | http://hdl.handle.net/10722/242260 | - |
dc.description.abstract | We show that an n − n− − n junction in 2D crystals can flexibly realize two basic valleytronic functions, i.e. valley filter and valley source, with gate controlled switchability between the two. Upon carrier flux passing through the junction, the valley filter and valley source functions are enabled respectively by intra- and inter-valley scatterings, and the two functions dominate respectively at small and large band-offset between the n and n− regions. It can be generally shown that, the valley filter effect has an angular dependent polarity and vanishes under angular integration, by the same constraint from time-reversal symmetry that leads to its absence in one dimension. These findings are demonstrated for monolayer transition metal dichalcogenides and graphene using tight-binding calculations. We further show that junction along chiral directions can concentrate the valley pump in an angular interval largely separated from the bias direction, allowing efficient havest of valley polarization in a cross-bar device. | - |
dc.language | eng | - |
dc.publisher | Institute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2053-1583/ | - |
dc.relation.ispartof | 2D Materials | - |
dc.rights | 2D Materials. Copyright © Institute of Physics Publishing Ltd. | - |
dc.rights | This is an author-created, un-copyedited version of an article published in [2D Materials]. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/10.1088/2053-1583/aa71fc | - |
dc.subject | 2D materials | - |
dc.subject | Lateral junction | - |
dc.subject | Valleytronics | - |
dc.title | Switchable valley functionalities of an n − n− − n junction in 2D crystals | - |
dc.type | Article | - |
dc.identifier.email | Tu, W: weiyuant@hku.hk | - |
dc.identifier.email | Yao, W: wangyao@hku.hk | - |
dc.identifier.authority | Yao, W=rp00827 | - |
dc.description.nature | postprint | - |
dc.identifier.doi | 10.1088/2053-1583/aa71fc | - |
dc.identifier.scopus | eid_2-s2.0-85021083401 | - |
dc.identifier.hkuros | 273488 | - |
dc.identifier.volume | 4 | - |
dc.identifier.issue | 2 | - |
dc.identifier.spage | 025109 | - |
dc.identifier.epage | 025109 | - |
dc.identifier.isi | WOS:000403207300002 | - |
dc.publisher.place | United Kingdom | - |
dc.identifier.issnl | 2053-1583 | - |