Momentum-resolved linear dichroism in bilayer MoS2

Klara Volckaert; Habib Rostami; Deepnarayan Biswas; Igor Marković; Federico Andreatta; Charlotte E. Sanders; Paulina Majchrzak; Cephise Cacho; Richard T. Chapman; Adam Wyatt; Emma Springate; Daniel Lizzit; Luca Bignardi; Silvano Lizzit; Sanjoy K. Mahatha; Marco Bianchi; Nicola Lanata; Phil D.C. King; Jill A. Miwa; Alexander V. Balatsky; Philip Hofmann; Søren Ulstrup

doi:10.1103/PhysRevB.100.241406

Momentum-resolved linear dichroism in bilayer MoS2

Klara Volckaert, Habib Rostami, Deepnarayan Biswas, Igor Marković, Federico Andreatta, Charlotte E. Sanders, Paulina Majchrzak, Cephise Cacho, Richard T. Chapman, Adam Wyatt, Emma Springate, Daniel Lizzit, Luca Bignardi, Silvano Lizzit, Sanjoy K. Mahatha, Marco Bianchi, Nicola Lanata, Phil D.C. King, Jill A. Miwa, Alexander V. BalatskyPhilip Hofmann, Søren Ulstrup

Department of Physics

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

13 Citations (SciVal)

Abstract

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- A nd momentum-resolved snapshots of excited electrons by time- A nd 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.

Original language	English
Article number	241406
Journal	Physical Review B
Volume	100
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevB.100.241406
Publication status	Published - 12 Dec 2019

Funding

We thank Phil Rice and Alistair Cox for technical support during the Artemis beamtime. We 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.

Funders	Funder number
Centre of Excellence for Dirac Materials	11744
Research Centre for Natural Sciences	DFF-4002-00029, DFF-6108-00409
Natur og Univers, Det Frie Forskningsråd
Villum Fonden	15375
Science and Technology Facilities Council
Aarhus Universitets Forskningsfond
Vetenskapsrådet	VR 2018-04252
International Max Planck Research School for Chemistry and Physics of Quantum Materials

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.100.241406

Cite this

Volckaert, K., Rostami, H., Biswas, D., Marković, I., Andreatta, F., Sanders, C. E., Majchrzak, P., Cacho, C., Chapman, R. T., Wyatt, A., Springate, E., Lizzit, D., Bignardi, L., Lizzit, S., Mahatha, S. K., Bianchi, M., Lanata, N., King, P. D. C., Miwa, J. A., ... Ulstrup, S. (2019). Momentum-resolved linear dichroism in bilayer MoS2. Physical Review B, 100(24), Article 241406. https://doi.org/10.1103/PhysRevB.100.241406

Volckaert, K, Rostami, H, Biswas, D, Marković, I, Andreatta, F, Sanders, CE, Majchrzak, P, Cacho, C, Chapman, RT, Wyatt, A, Springate, E, Lizzit, D, Bignardi, L, Lizzit, S, Mahatha, SK, Bianchi, M, Lanata, N, King, PDC, Miwa, JA, Balatsky, AV, Hofmann, P & Ulstrup, S 2019, 'Momentum-resolved linear dichroism in bilayer MoS2', Physical Review B, vol. 100, no. 24, 241406. https://doi.org/10.1103/PhysRevB.100.241406

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abstract = "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- A nd momentum-resolved snapshots of excited electrons by time- A nd 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.",

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AU - Majchrzak, Paulina

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AU - Chapman, Richard T.

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AU - Springate, Emma

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AU - Bignardi, Luca

AU - Lizzit, Silvano

AU - Mahatha, Sanjoy K.

AU - Bianchi, Marco

AU - Lanata, Nicola

AU - King, Phil D.C.

AU - Miwa, Jill A.

AU - Balatsky, Alexander V.

AU - Hofmann, Philip

AU - Ulstrup, Søren

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Momentum-resolved linear dichroism in bilayer MoS2

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