Spin-orbit engineering in transition metal dichalcogenide alloy monolayers

Gang Wang; Cedric Robert; Aslihan Suslu; Bin Chen; Sijie Yang; Sarah Alamdari; Iann C. Gerber; Thierry Amand; Xavier Marie; Sefaattin Tongay; Bernhard Urbaszek

doi:10.1038/ncomms10110

Spin-orbit engineering in transition metal dichalcogenide alloy monolayers

Gang Wang, Cedric Robert, Aslihan Suslu, Bin Chen, Sijie Yang, Sarah Alamdari, Iann C. Gerber, Thierry Amand, Xavier Marie, Sefaattin Tongay^*, Bernhard Urbaszek

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

162 Scopus citations

Abstract

Binary transition metal dichalcogenide monolayers share common properties such as a direct optical bandgap, spin-orbit splittings of hundreds of meV, light-matter interaction dominated by robust excitons and coupled spin-valley states. Here we demonstrate spin-orbit-engineering in Mo_(1-x)WxSe₂ alloy monolayers for optoelectronics and applications based on spin- And valley-control. We probe the impact of the tuning of the conduction band spin-orbit spin-splitting on the bright versus dark exciton population. For MoSe₂ monolayers, the photoluminescence intensity decreases as a function of temperature by an order of magnitude (4-300 K), whereas for WSe₂ we measure surprisingly an order of magnitude increase. The ternary material shows a trend between these two extreme behaviours. We also show a non-linear increase of the valley polarization as a function of tungsten concentration, where 40% tungsten incorporation is sufficient to achieve valley polarization as high as in binary WSe₂.

Original language	English (US)
Article number	10110
Journal	Nature communications
Volume	6
DOIs	https://doi.org/10.1038/ncomms10110
State	Published - 2015

ASJC Scopus subject areas

Physics and Astronomy(all)
Chemistry(all)
Biochemistry, Genetics and Molecular Biology(all)

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@article{a543ac59fe3e4777887a95ca8f86a62c,

title = "Spin-orbit engineering in transition metal dichalcogenide alloy monolayers",

abstract = "Binary transition metal dichalcogenide monolayers share common properties such as a direct optical bandgap, spin-orbit splittings of hundreds of meV, light-matter interaction dominated by robust excitons and coupled spin-valley states. Here we demonstrate spin-orbit-engineering in Mo(1-x)WxSe2 alloy monolayers for optoelectronics and applications based on spin- And valley-control. We probe the impact of the tuning of the conduction band spin-orbit spin-splitting on the bright versus dark exciton population. For MoSe2 monolayers, the photoluminescence intensity decreases as a function of temperature by an order of magnitude (4-300 K), whereas for WSe2 we measure surprisingly an order of magnitude increase. The ternary material shows a trend between these two extreme behaviours. We also show a non-linear increase of the valley polarization as a function of tungsten concentration, where 40% tungsten incorporation is sufficient to achieve valley polarization as high as in binary WSe2.",

author = "Gang Wang and Cedric Robert and Aslihan Suslu and Bin Chen and Sijie Yang and Sarah Alamdari and Gerber, {Iann C.} and Thierry Amand and Xavier Marie and Sefaattin Tongay and Bernhard Urbaszek",

note = "Funding Information: We acknowledge funding from ERC Grant No. 306719, ANR MoS2ValleyControl. I.C.G. acknowledges the CNRS for financial support and CALMIP initiative for the generous allocation of computational times, through the project p0812, as well as the GENCI-CINES and GENCI-IDRIS for the grant x2015096649. S.T. acknowledges Arizona State University start-up grant and Ira. A. Fulton College of Engineering Origami Seeding Funds. X.M. acknowledges support of Institut Universitaire de France.",

year = "2015",

doi = "10.1038/ncomms10110",

language = "English (US)",

volume = "6",

journal = "Nature communications",

issn = "2041-1723",

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T1 - Spin-orbit engineering in transition metal dichalcogenide alloy monolayers

AU - Wang, Gang

AU - Robert, Cedric

AU - Suslu, Aslihan

AU - Chen, Bin

AU - Yang, Sijie

AU - Alamdari, Sarah

AU - Gerber, Iann C.

AU - Amand, Thierry

AU - Marie, Xavier

AU - Tongay, Sefaattin

AU - Urbaszek, Bernhard

N1 - Funding Information: We acknowledge funding from ERC Grant No. 306719, ANR MoS2ValleyControl. I.C.G. acknowledges the CNRS for financial support and CALMIP initiative for the generous allocation of computational times, through the project p0812, as well as the GENCI-CINES and GENCI-IDRIS for the grant x2015096649. S.T. acknowledges Arizona State University start-up grant and Ira. A. Fulton College of Engineering Origami Seeding Funds. X.M. acknowledges support of Institut Universitaire de France.

PY - 2015

Y1 - 2015

N2 - Binary transition metal dichalcogenide monolayers share common properties such as a direct optical bandgap, spin-orbit splittings of hundreds of meV, light-matter interaction dominated by robust excitons and coupled spin-valley states. Here we demonstrate spin-orbit-engineering in Mo(1-x)WxSe2 alloy monolayers for optoelectronics and applications based on spin- And valley-control. We probe the impact of the tuning of the conduction band spin-orbit spin-splitting on the bright versus dark exciton population. For MoSe2 monolayers, the photoluminescence intensity decreases as a function of temperature by an order of magnitude (4-300 K), whereas for WSe2 we measure surprisingly an order of magnitude increase. The ternary material shows a trend between these two extreme behaviours. We also show a non-linear increase of the valley polarization as a function of tungsten concentration, where 40% tungsten incorporation is sufficient to achieve valley polarization as high as in binary WSe2.

AB - Binary transition metal dichalcogenide monolayers share common properties such as a direct optical bandgap, spin-orbit splittings of hundreds of meV, light-matter interaction dominated by robust excitons and coupled spin-valley states. Here we demonstrate spin-orbit-engineering in Mo(1-x)WxSe2 alloy monolayers for optoelectronics and applications based on spin- And valley-control. We probe the impact of the tuning of the conduction band spin-orbit spin-splitting on the bright versus dark exciton population. For MoSe2 monolayers, the photoluminescence intensity decreases as a function of temperature by an order of magnitude (4-300 K), whereas for WSe2 we measure surprisingly an order of magnitude increase. The ternary material shows a trend between these two extreme behaviours. We also show a non-linear increase of the valley polarization as a function of tungsten concentration, where 40% tungsten incorporation is sufficient to achieve valley polarization as high as in binary WSe2.

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Spin-orbit engineering in transition metal dichalcogenide alloy monolayers

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