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  Generation and Evolution of Spin-, Valley-, and Layer-Polarized Excited Carriers in Inversion-Symmetric WSe2

Bertoni, R., Nicholson, C., Waldecker, L., Hübener, H., Monney, C., De Giovannini, U., et al. (2016). Generation and Evolution of Spin-, Valley-, and Layer-Polarized Excited Carriers in Inversion-Symmetric WSe2. Physical Review Letters, 117(27): 277201. doi:10.1103/PhysRevLett.117.277201.

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 Urheber:
Bertoni, Roman1, Autor           
Nicholson, Christopher1, Autor           
Waldecker, Lutz1, Autor           
Hübener, Hannes2, Autor
Monney, Claude3, Autor
De Giovannini, Umberto2, 4, Autor
Puppin, Michele1, Autor           
Hoesch, Moritz5, Autor
Springate, Emma6, Autor
Chapman, Richard T.6, Autor
Cacho, Cephise6, Autor
Wolf, Martin1, Autor           
Rubio, Angel2, 7, Autor
Ernstorfer, Ralph1, Autor           
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Nano-Bio Spectroscopy Group and ETSF, Universidad del Pais Vasco, CFM CSIC-UPV/EHU, 20018 San Sebastian, Spain, ou_persistent22              
3University of Zurich, Department of Physics, Winterthurerstrasse 190, 8057 Zürich, Switzerland, ou_persistent22              
4Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Via Archirafi 36, I-90123 Palermo, Italy, ou_persistent22              
5Diamond Light Source, Harwell Campus, Didcot OX11 0DE, United Kingdom, ou_persistent22              
6Central Laser Facility, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot OX11 0QX, United Kingdom, ou_persistent22              
7Max Planck Institute for the Structure and Dynamics of Matter and Center for Free-Electron Laser Science, Notkestraße 85, 22761 Hamburg, Germany, ou_persistent22              

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 Zusammenfassung: Manipulation of spin and valley degrees of freedom is a key step towards realizing novel quantum technologies, for which atomically thin transition metal dichalcogenides (TMDCs) have been established as promising candidates. In monolayer TMDCs, the lack of inversion symmetry gives rise to a spin-valley correlation of the band structure allowing for valley-selective electronic excitation with circularly polarized light. Here we show that, even in centrosymmetric samples of 2H-WSe2, circularly polarized light can generate spin-, valley- and layer-polarized excited states in the conduction band. Employing time- and angle-resolved photoemission spectroscopy (trARPES) with spin-selective excitation, the dynamics of valley and layer pseudospins of the excited carriers are investigated. Complementary time-dependent density functional theory (TDDFT) calculations of the excited state populations reveal a strong circular dichroism of the spin-, valley- and layer-polarizations and a pronounced 2D character of the excited states in the K valleys. We observe scattering of carriers towards the global minimum of the conduction band on a sub-100 femtosecond timescale to states with three-dimensional character facilitating inter-layer charge transfer. Our results establish the optical control of coupled spin-, valley- and layer-polarized states in centrosymmetric materials and suggest the suitability of TMDC multilayer materials for valleytronic and spintronic device concepts.

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 Datum: 2016-07-182016-12-30
 Publikationsstatus: Erschienen
 Seiten: 5
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1103/PhysRevLett.117.277201
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Projektname : DYNAMO - Dynamical processes in open quantum systems: pushing the frontiers of theoretical spectroscopy
Grant ID : 267374
Förderprogramm : Funding Programme 7 (FP7)
Förderorganisation : European Commission (EC)

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Titel: Physical Review Letters
  Kurztitel : Phys. Rev. Lett.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Woodbury, N.Y. : American Physical Society
Seiten: 5 Band / Heft: 117 (27) Artikelnummer: 277201 Start- / Endseite: - Identifikator: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1