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Direct Observation of Enhanced Electron-Phonon Coupling in Copper Nanoparticles in the Warm-Dense Matter Regime
- Title
- Direct Observation of Enhanced Electron-Phonon Coupling in Copper Nanoparticles in the Warm-Dense Matter Regime
- Authors
- Nguyen Q.L.D.; Simoni J.; Dorney K.M.; Shi X.; Ellis J.L.; Brooks N.J.; Hickstein D.D.; Grennell A.G.; Yazdi S.; Campbell E.E.B.; Tan L.Z.; Prendergast D.; Daligault J.; Kapteyn H.C.; Murnane M.M.
- Ewha Authors
- Eleanor E. B. Campbell
- SCOPUS Author ID
- Eleanor E. B. Campbell
- Issue Date
- 2023
- Journal Title
- Physical Review Letters
- ISSN
- 3190-9007
- Citation
- Physical Review Letters vol. 131, no. 8
- Publisher
- American Physical Society
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- Warm dense matter (WDM) represents a highly excited state that lies at the intersection of solids, plasmas, and liquids and that cannot be described by equilibrium theories. The transient nature of this state when created in a laboratory, as well as the difficulties in probing the strongly coupled interactions between the electrons and the ions, make it challenging to develop a complete understanding of matter in this regime. In this work, by exciting isolated ∼8 nm copper nanoparticles with a femtosecond laser below the ablation threshold, we create uniformly excited WDM. Using photoelectron spectroscopy, we measure the instantaneous electron temperature and extract the electron-ion coupling of the nanoparticle as it undergoes a solid-to-WDM phase transition. By comparing with state-of-the-art theories, we confirm that the superheated nanoparticles lie at the boundary between hot solids and plasmas, with associated strong electron-ion coupling. This is evidenced both by a fast energy loss of electrons to ions, and a strong modulation of the electron temperature induced by strong acoustic breathing modes that change the nanoparticle volume. This work demonstrates a new route for experimental exploration of the exotic properties of WDM. © 2023 American Physical Society.
- DOI
- 10.1103/PhysRevLett.131.085101
- Appears in Collections:
- 자연과학대학 > 물리학전공 > Journal papers
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