Direct Measurement of Ballistic and Diffusive Electron Transport in Gold
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TL;DR: In this paper , the ballistic length of hot electrons in laser-heated gold films can exceed ∼150 nm, which is ∼50% greater than the previously reported value of 100 nm inferred from pump-probe experiments.
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Abstract: We experimentally show that the ballistic length of hot electrons in laser-heated gold films can exceed ∼150 nm, which is ∼50% greater than the previously reported value of 100 nm inferred from pump–probe experiments. We also find that the mean free path of electrons at the peak temperature following interband excitation can reach upward of ∼45 nm, which is higher than the average value of 30 nm predicted from our parameter-free density functional perturbation theory. Our first-principles calculations of electron–phonon coupling reveal that the increase in the mean free path due to interband excitation is a consequence of drastically reduced electron–phonon coupling from lattice stiffening, thus providing the microscopic understanding of our experimental findings.
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Citations
Laser-initiated electron and heat transport in gold-skutterudite CoSb3 bilayers resolved by pulsed x-ray scattering
Anton Plech,P. Gaal,Daniel Schmidt,Matteo Levantino,M. Daniel,S. Stankov,Gernot Buth,Manfred Albrecht +7 more
TL;DR: Pulsed x-ray scattering resolves electron and heat transport in gold-CoSb3 bilayers after photo-excitation, revealing ballistic electron transport and varying heat partition with laser fluence and wavelength, influenced by electron temperature and equilibration time.
Electron-electron scattering limits thermal conductivity of metals underextremely high electron temperatures.
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TL;DR: Electron-electron scattering limits thermal conductivity of metals under extreme electron temperatures, limiting the accuracy of neglecting electron-electron scattering in theoretical predictions of thermal conductivity.
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Haechan An,Ali Najjar Amiri,Dominic P. Goronzy,David A. Garcia‐Wetten,Michael J. Bedzyk,Ali Shakouri,Mark C. Hersam,Mahdi Hosseini +7 more
TL;DR: Quantum squeezed light enables high-sensitivity thermoreflective imaging with single-shot temperature sensing down to 1.6 K and high-resolution imaging of heat distribution in wires and semiconductors.
Electron-phonon coupling dictates electron mean free paths and negative thermal diffusion in metals
Pravin Karna,Md Rafiqul Islam,Eric R. Hoglund,Patrick E. Hopkins,Ashutosh Giri +4 more
TL;DR: Researchers use ultrafast microscopy to measure electron mean free paths in metals, finding that electron-phonon coupling dictates mean free paths and controls negative thermal diffusion, which is observable in metals with weaker coupling.
Electron–phonon coupling and non-equilibrium thermal conduction in ultra-fast heating systems
Chuang Zhang,Rulei Guo,Meng Liang,Junichiro Shiomi +3 more
TL;DR: Electron-phonon coupling and non-equilibrium thermal conduction in ultra-fast heating systems is studied using a discrete unified gas kinetic scheme. The scheme accurately captures electron-phonon coupling effects and exhibits ballistic effects when the characteristic length is comparable to or smaller than the mean free path. Two anomalous heat conduction phenomena are predicted.
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