Distinguishing attosecond electron–electron scattering and screening in transition metals
Abstract
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 ~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 (≈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 bymore »
- Authors:
- Publication Date:
- Research Org.:
- Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1367774
- Alternate Identifier(s):
- OSTI ID: 1465969; OSTI ID: 1680043
- Grant/Contract Number:
- SC0002002
- Resource Type:
- Published Article
- Journal Name:
- Proceedings of the National Academy of Sciences of the United States of America
- Additional Journal Information:
- Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 114 Journal Issue: 27; Journal ID: ISSN 0027-8424
- Publisher:
- National Academy of Sciences
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Attosecond science; high harmonic generation; ARPES; electron-electron interactions
Citation Formats
Chen, Cong, Tao, Zhensheng, Carr, Adra, Matyba, Piotr, Szilvási, Tibor, Emmerich, Sebastian, Piecuch, Martin, Keller, Mark, Zusin, Dmitriy, Eich, Steffen, Rollinger, Markus, You, Wenjing, Mathias, Stefan, Thumm, Uwe, Mavrikakis, Manos, Aeschlimann, Martin, Oppeneer, Peter M., Kapteyn, Henry, and Murnane, Margaret. Distinguishing attosecond electron–electron scattering and screening in transition metals. United States: N. p., 2017.
Web. doi:10.1073/pnas.1706466114.
Chen, Cong, Tao, Zhensheng, Carr, Adra, Matyba, Piotr, Szilvási, Tibor, Emmerich, Sebastian, Piecuch, Martin, Keller, Mark, Zusin, Dmitriy, Eich, Steffen, Rollinger, Markus, You, Wenjing, Mathias, Stefan, Thumm, Uwe, Mavrikakis, Manos, Aeschlimann, Martin, Oppeneer, Peter M., Kapteyn, Henry, & Murnane, Margaret. Distinguishing attosecond electron–electron scattering and screening in transition metals. United States. https://doi.org/10.1073/pnas.1706466114
Chen, Cong, Tao, Zhensheng, Carr, Adra, Matyba, Piotr, Szilvási, Tibor, Emmerich, Sebastian, Piecuch, Martin, Keller, Mark, Zusin, Dmitriy, Eich, Steffen, Rollinger, Markus, You, Wenjing, Mathias, Stefan, Thumm, Uwe, Mavrikakis, Manos, Aeschlimann, Martin, Oppeneer, Peter M., Kapteyn, Henry, and Murnane, Margaret. Mon .
"Distinguishing attosecond electron–electron scattering and screening in transition metals". United States. https://doi.org/10.1073/pnas.1706466114.
@article{osti_1367774,
title = {Distinguishing attosecond electron–electron scattering and screening in transition metals},
author = {Chen, Cong and Tao, Zhensheng and Carr, Adra and Matyba, Piotr and Szilvási, Tibor and Emmerich, Sebastian and Piecuch, Martin and Keller, Mark and Zusin, Dmitriy and Eich, Steffen and Rollinger, Markus and You, Wenjing and Mathias, Stefan and Thumm, Uwe and Mavrikakis, Manos and Aeschlimann, Martin and Oppeneer, Peter M. and Kapteyn, Henry and Murnane, Margaret},
abstractNote = {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 ~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 (≈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.},
doi = {10.1073/pnas.1706466114},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 27,
volume = 114,
place = {United States},
year = {Mon Jun 19 00:00:00 EDT 2017},
month = {Mon Jun 19 00:00:00 EDT 2017}
}
https://doi.org/10.1073/pnas.1706466114
Web of Science
Figures / Tables:
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