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Distinguishing attosecond electron-electron scattering and screening in transition metals
Umeå University, Faculty of Science and Technology, Department of Physics. JILA, Department of Physics, University of Colorado and National Institute of Standards and Technology, Boulder, CO 80309, United States.
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2017 (English)In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 114, no 27, p. E5300-E5307Article in journal (Refereed) Published
Abstract [en]

Electron-electron interactions are the fastest processes in materials, occurring on femtosecond to attosecond timescales, depending on the electronic band structure of the material and the excitation energy. Such interactions can play a dominant role in light-induced processes such as nano-enhanced plasmonics and catalysis, light harvesting, or phase transitions. However, to date it has not been possible to experimentally distinguish fundamental electron interactions such as scattering and screening. Here, we use sequences of attosecond pulses to directly measure electron-electron interactions in different bands of different materials with both simple and complex Fermi surfaces. By extracting the time delays associated with photoemission we show that the lifetime of photoelectrons from the d band of Cu are longer by similar to 100 as compared with those from the same band of Ni. We attribute this to the enhanced electron-electron scattering in the unfilled d band of Ni. Using theoretical modeling, we can extract the contributions of electron-electron scattering and screening in different bands of different materials with both simple and complex Fermi surfaces. Our results also show that screening influences high-energy photoelectrons (approximate to 20 eV) significantly less than low-energy photoelectrons. As a result, high-energy photoelectrons can serve as a direct probe of spin-dependent electron-electron scattering by neglecting screening. This can then be applied to quantifying the contribution of electron interactions and screening to low-energy excitations near the Fermi level. The information derived here provides valuable and unique information for a host of quantum materials.

Place, publisher, year, edition, pages
National Academy of Sciences , 2017. Vol. 114, no 27, p. E5300-E5307
Keywords [en]
attosecond science, high harmonic generation, ARPES, electron-electron interactions
National Category
Condensed Matter Physics Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-138544DOI: 10.1073/pnas.1706466114ISI: 000404576100006PubMedID: 28630331OAI: oai:DiVA.org:umu-138544DiVA, id: diva2:1144191
Available from: 2017-09-25 Created: 2017-09-25 Last updated: 2018-06-09Bibliographically approved

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Matyba, Piotr

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