Momentum-resolved linear dichroism in bilayer MoS2
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In solid state photoemission experiments it is possible to extract information about the symmetry and orbital character of the electronic wave functions via the photoemission selection rules that shape the measured intensity. This approach can be expanded in a pump-probe experiment where the intensity contains additional information about interband excitations induced by an ultrafast laser pulse with tunable polarization. Here, we find an unexpected strong linear dichroism effect (up to 42.4%) in the conduction band of bilayer MoS2, when measuring energy- and momentum-resolved snapshots of excited electrons by time- and angle-resolved photoemission spectroscopy. We model the polarization-dependent photoemission intensity in the transiently-populated conduction band using the semiconductor Bloch equations. Our theoretical analysis reveals a strongly anisotropic momentum-dependence of the optical excitations due to intralayer single-particle hopping, which explains the observed linear dichroism.
Volckaert , K , Rostami , H , Biswas , D , Markovic , I , Andreatta , F , Sanders , C , Majchrzak , P , Cacho , C , Chapman , R T , Wyatt , A , Springate , E , Lizzit , D , Bignardi , L , Lizzit , S , Mahatha , S , Bianchi , M , Lanata , N , King , P , Miwa , J A , Balatsky , A , Hofmann , P & Ulstrup , S 2019 , ' Momentum-resolved linear dichroism in bilayer MoS 2 ' , Physical Review. B, Condensed matter and materials physics , vol. 100 , 241406(R) . https://doi.org/10.1103/PhysRevB.100.241406
Physical Review. B, Condensed matter and materials physics
Copyright © 2019 American Physical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1103/PhysRevB.100.241406
DescriptionAuthors gratefully acknowledge funding from VILLUM FONDEN through the Young Investigator Program (Grant No. 15375) and the Centre of Excellence for Dirac Materials (Grant No. 11744), the Danish Council for Independent Research, Natural Sciences under the Sapere Aude program (Grants No. DFF-4002-00029 and No. DFF-6108-00409), and the Aarhus University Research Foundation. Access to the Artemis Facility was funded by STFC. H.R. acknowledges the support from the Swedish Research Council (VR 2018-04252). I.M. acknowledges financial support by the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). The authors also acknowledge The Royal Society and The Leverhulme Trust.
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