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Journal Article

Direct measurement of key exciton properties: Energy, dynamics, and spatial distribution of the wave function

MPS-Authors
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Dong,  Shuo
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Puppin,  Michele
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Laboratoire de Spectroscopie Ultrarapide and Lausanne Centre for Ultrafast Science (LACUS), Ecole polytechnique federale de Lausanne;

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Pincelli,  Tommaso
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Beaulieu,  Samuel
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

Hübener,  Hannes
Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Nicholson,  Christopher W.
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Departement de Physique and Fribourg Center for Nanomaterials, Universite de Fribourg;

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Xian,  R. Patrick
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Dendzik,  Maciej Ramon
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Applied Physics, KTH Royal Institute of Technology;

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Deng,  Yunpei
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
SwissFEL, Paul Scherrer Institute;

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Windsor,  Yoav William
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

Rubio,  Angel
Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Wolf,  Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Rettig,  Laurenz
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Ernstorfer,  Ralph
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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2012.15328.pdf
(Preprint), 26MB

ntls.10010.pdf
(Publisher version), 2MB

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Citation

Dong, S., Puppin, M., Pincelli, T., Beaulieu, S., Christiansen, D., Hübener, H., et al. (2021). Direct measurement of key exciton properties: Energy, dynamics, and spatial distribution of the wave function. Natural Sciences, 1(1): e10010. doi:10.1002/ntls.10010.


Cite as: https://hdl.handle.net/21.11116/0000-0007-DA0F-4
Abstract
Excitons, Coulomb-bound electron-hole pairs, are the fundamental excitations governing optoelectronic properties of semiconductors. While optical signatures of excitons have been studied extensively, experimental access to the excitonic wave function itself has been elusive. Using multidimensional photoemission
spectroscopy, we present a momentum-, energy- and time-resolved perspective on
excitons in the layered semiconductor WSe2. By tuning the excitation
wavelength, we determine the energy-momentum signature of bright exciton
formation and its difference from conventional single-particle excited states. The multidimensional data allows to retrieve fundamental exciton properties like the binding energy and the exciton-lattice coupling and to reconstruct the real-space excitonic wave function via Fourier transform. All quantities are in excellent agreement with microscopic calculations. Our approach provides a full characterization of the exciton wave function and is applicable to bright and dark excitons in semiconducting materials, heterostructures, and devices.