Layer and orbital interference effects in photoemission from transition metal dichalcogenides

Habib Rostami; Klara Volckaert; Nicola Lanata; Sanjoy K. Mahatha; Charlotte E. Sanders; Marco Bianchi; Daniel Lizzit; Luca Bignardi; Silvano Lizzit; Jill A. Miwa; Alexander V. Balatsky; Philip Hofmann; Søren Ulstrup

doi:10.1103/PhysRevB.100.235423

Layer and orbital interference effects in photoemission from transition metal dichalcogenides

Habib Rostami, Klara Volckaert, Nicola Lanata, Sanjoy K. Mahatha, Charlotte E. Sanders, Marco Bianchi, Daniel Lizzit, Luca Bignardi, Silvano Lizzit, Jill A. Miwa, Alexander V. Balatsky, Philip Hofmann, Søren Ulstrup

Department of Physics

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

13 Citations (SciVal)

Abstract

In this work, we provide an effective model to evaluate the one-electron dipole matrix elements governing optical excitations and the photoemission process of single-layer (SL) and bilayer (BL) transition metal dichalcogenides. By utilizing a k·p Hamiltonian, we calculate the photoemission intensity as observed in angle-resolved photoemission from the valence bands around the K̄ valley of MoS2. In SL MoS2, we find a significant masking of intensity outside the first Brillouin zone, which originates from an in-plane interference effect between photoelectrons emitted from the Mo d orbitals. In BL MoS2, an additional interlayer interference effect leads to a distinctive modulation of intensity with photon energy. Finally, we use the semiconductor Bloch equations to model the optical excitation in a time- and angle-resolved pump-probe photoemission experiment. We find that the momentum dependence of an optically excited population in the conduction band leads to an observable dichroism in both SL and BL MoS2.

Original language	English
Article number	235423
Journal	Physical Review B
Volume	100
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevB.100.235423
Publication status	Published - 12 Dec 2019

Bibliographical note

Publisher Copyright:
© 2019 American Physical Society.

Funding

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 (Grant Nos. DFF-4002-00029 and DFF-6108-00409) and the Aarhus University Research Foundation. H.R. acknowledges the support from the Swedish Research Council (VR 2018-04252).

Funders	Funder number
Research Centre for Natural Sciences	DFF-4002-00029, DFF-6108-00409
Natur og Univers, Det Frie Forskningsråd
Villum Fonden	11744
Aarhus Universitets Forskningsfond
Vetenskapsrådet	VR 2018-04252

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.100.235423

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Rostami, H., Volckaert, K., Lanata, N., Mahatha, S. K., Sanders, C. E., Bianchi, M., Lizzit, D., Bignardi, L., Lizzit, S., Miwa, J. A., Balatsky, A. V., Hofmann, P., & Ulstrup, S. (2019). Layer and orbital interference effects in photoemission from transition metal dichalcogenides. Physical Review B, 100(23), Article 235423. https://doi.org/10.1103/PhysRevB.100.235423

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abstract = "In this work, we provide an effective model to evaluate the one-electron dipole matrix elements governing optical excitations and the photoemission process of single-layer (SL) and bilayer (BL) transition metal dichalcogenides. By utilizing a k·p Hamiltonian, we calculate the photoemission intensity as observed in angle-resolved photoemission from the valence bands around the {\=K} valley of MoS2. In SL MoS2, we find a significant masking of intensity outside the first Brillouin zone, which originates from an in-plane interference effect between photoelectrons emitted from the Mo d orbitals. In BL MoS2, an additional interlayer interference effect leads to a distinctive modulation of intensity with photon energy. Finally, we use the semiconductor Bloch equations to model the optical excitation in a time- and angle-resolved pump-probe photoemission experiment. We find that the momentum dependence of an optically excited population in the conduction band leads to an observable dichroism in both SL and BL MoS2.",

author = "Habib Rostami and Klara Volckaert and Nicola Lanata and Mahatha, {Sanjoy K.} and Sanders, {Charlotte E.} and Marco Bianchi and Daniel Lizzit and Luca Bignardi and Silvano Lizzit and Miwa, {Jill A.} and Balatsky, {Alexander V.} and Philip Hofmann and S{\o}ren Ulstrup",

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doi = "10.1103/PhysRevB.100.235423",

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AU - Rostami, Habib

AU - Volckaert, Klara

AU - Lanata, Nicola

AU - Mahatha, Sanjoy K.

AU - Sanders, Charlotte E.

AU - Bianchi, Marco

AU - Lizzit, Daniel

AU - Bignardi, Luca

AU - Lizzit, Silvano

AU - Miwa, Jill A.

AU - Balatsky, Alexander V.

AU - Hofmann, Philip

AU - Ulstrup, Søren

PY - 2019/12/12

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Layer and orbital interference effects in photoemission from transition metal dichalcogenides

Abstract

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