English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Few-Femtosecond Dynamics of Free-Free Opacity in Optically Heated Metals

Niedermayr, A., Volkov, M., Sato, S., Hartmann, N., Schumacher, Z., Neb, S., et al. (2022). Few-Femtosecond Dynamics of Free-Free Opacity in Optically Heated Metals. Physical Review X, 12(2): 021045. doi:10.1103/PhysRevX.12.021045.

Item is

Basic

show hide
Genre: Journal Article

Files

show Files
hide Files
:
PhysRevX.12.021045.pdf (Publisher version), 2MB
Name:
PhysRevX.12.021045.pdf
Description:
Open Access.
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
2022
Copyright Info:
© the Author(s). Published by the American Physical Society

Locators

show
hide
Locator:
https://doi.org/10.1103/PhysRevX.12.021045 (Publisher version)
Description:
-

Creators

show
hide
 Creators:
Niedermayr, A.1, Author
Volkov, M.1, 2, Author
Sato, S.3, 4, Author              
Hartmann, N.1, Author
Schumacher, Z.1, Author
Neb, S.1, Author
Rubio, A.4, 5, Author              
Gallmann, L.1, Author
Keller, U.1, Author
Affiliations:
1Department of Physics, ETH Zurich, ou_persistent22              
2University of Konstanz, ou_persistent22              
3Center for Computational Sciences, University of Tsukuba, ou_persistent22              
4Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
5Center for Computational Quantum Physics (CCQ), Flatiron Institute, ou_persistent22              

Content

show
hide
Free keywords: -
 Abstract: Interaction of light with an excited free-electron gas is a fundamental process spanning a large variety of fields in physics. The advent of femtosecond laser pulses and extreme-ultraviolet sources allowed one to put theoretical models to the test. Recent experimental and theoretical investigations of nonequilibrium aluminum, which is considered to be a good real-world representation of an ideal free-electron metal, showed that, despite significant progress, the transient hot-electron/cold-ion state is not well understood. In particular, the role of plasmon broadening, screening, and electron degeneracy remains unclear. Here, we experimentally investigate the free-free opacity in aluminum on the few-femtosecond timescale at laser intensities close to the damage threshold. Few-femtosecond time resolution allows us to track the purely electronic contribution to nonequilibrium absorption and unambiguously separate it from the slower lattice contribution. We support the experiments with ab initio calculations and a nearly free electron model in the Sommerfeld expansion. We find that the simplest independent-particle model with a fixed band structure is sufficient to explain the experimental findings without the need to include changes in screening or electron scattering, contrasting previous observations in 3d transition metals. We further find that electronic heating of a free-electron gas shifts the spectral weight of the absorption to higher photon energies, and we are able to distinguish the influence of the population change and the chemical potential shift based on the comparison of ab initio calculations to a simplified free-electron model. Our findings provide a benchmark for further investigations and modeling of dense nonequilibrium plasma under even more extreme conditions.

Details

show
hide
Language(s): eng - English
 Dates: 2021-06-012022-03-152022-05-25
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevX.12.021045
 Degree: -

Event

show

Legal Case

show

Project information

show hide
Project name : -
Grant ID : 801459
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)
Project name : This work was supported by JSPS KAKENHI Grant No. JP20K14382, the European Research Council (ERC-2015-AdG694097), the Cluster of Excellence “CUI: Advanced Imaging of Matter” of the Deutsche Forschungsgemeinschaft (DFG)—EXC 2056—Project ID No. 390715994, Grupos Consolidados UPV/EHU (IT1249- 19), partially by the Federal Ministry of Education and Research Grant No. RouTe-13N14839, and the SFB925 “Light induced dynamics and control of correlated quantum systems.”
Grant ID : -
Funding program : -
Funding organization : -

Source 1

show
hide
Title: Physical Review X
  Abbreviation : Phys. Rev. X
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: New York, NY : American Physical Society
Pages: - Volume / Issue: 12 (2) Sequence Number: 021045 Start / End Page: - Identifier: Other: 2160-3308
CoNE: https://pure.mpg.de/cone/journals/resource/2160-3308