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Distinguishing attosecond electron-electron scattering and screening in transition metals
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik. JILA, Department of Physics, University of Colorado and National Institute of Standards and Technology, Boulder, CO 80309, United States.
Vise andre og tillknytning
2017 (engelsk)Inngår i: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 114, nr 27, s. E5300-E5307Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
National Academy of Sciences , 2017. Vol. 114, nr 27, s. E5300-E5307
Emneord [en]
attosecond science, high harmonic generation, ARPES, electron-electron interactions
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-138544DOI: 10.1073/pnas.1706466114ISI: 000404576100006PubMedID: 28630331OAI: oai:DiVA.org:umu-138544DiVA, id: diva2:1144191
Tilgjengelig fra: 2017-09-25 Laget: 2017-09-25 Sist oppdatert: 2018-06-09bibliografisk kontrollert

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