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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Thermal Conductivity of Covalent-Organic Frameworks.
TL;DR: This Perspective reviews thermal conductivities of Covalent-Organic Frameworks (COFs), discusses current limitations, and proposes pathways to overcome them, aiming to stimulate interdisciplinary research for thermal management applications and wide adoption of COFs.
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Quantum-mechanical effects in photoluminescence from thin crystalline gold films
Alan R. Bowman,Álvaro Rodríguez Echarri,Fatemeh Kiani,Fadıl İyikanat,Ted V. Tsoulos,Joel D. Cox,Ravishankar Sundararaman,F. Javier Garcı́a de Abajo,Giulia Tagliabue +8 more
TL;DR: Quantum-mechanical effects in photoluminescence from thin crystalline gold films reveal the microscopic origin of luminescence and pave the way for future explorations of hot carriers and charge-transfer dynamics.
Quantum-mechanical effects in photoluminescence from thin crystalline gold films
Alan R. Bowman,Fatemeh Kiani,Fadil Iyikanat,Ted V. Tsoulos,Joel D. Cox,Ravishankar Sundararaman,F. Javier García de Abajo,Giulia Tagliabue +7 more
- 17 Jul 2023
TL;DR: In this article , a first-principles parameterized model of bulk gold luminescence was developed to demonstrate that gold luminance is photoluminescence when exciting in the interband regime.
Regulation of Hot Electrons Transport Achieved through Controlled Electron-Phonon Coupling in Metallic Heterostructures.
Yingjie Wang,Keming Li,Lan Jiang,Guoquan Gao,Jiafang Li,Tong Zhu +5 more
TL;DR: Regulation of hot electron transport through controlled electron-phonon coupling in metallic heterostructures enhances heat relaxation and reduces diffusion length.
2
Quantum-mechanical effects in photoluminescence from thin crystalline gold films
Alan R. Bowman,Álvaro Rodríguez Echarri,Fatemeh Kiani,Fadıl İyikanat,Ted V. Tsoulos,Joel D. Cox,Ravishankar Sundararaman,F. Javier Garcı́a de Abajo,Giulia Tagliabue +8 more
- 01 Jan 2023
TL;DR: Quantum-mechanical effects in photoluminescence from thin crystalline gold films reveal the out-of-plane discreteness of the electronic band structure near the Fermi level.
1
References
Ultrafast Spectroscopy of Electron-Phonon Coupling in Gold
Liang Guo,Xianfan Xu +1 more
TL;DR: In this article, the authors measured the transient reflectance of gold using ultrafast spectroscopy by varying the wavelength of the probe laser beam in the visible range, based on the band structure of gold, the influence of probe beam wavelength on the signal trend is analyzed in terms of sensitivity, effect of nonthermalized electrons and relaxation rate.
Experimental evidence of excited electron number density and temperature effects on electron-phonon coupling in gold films
TL;DR: In this article, a series of measurements of electron relaxation over a predicted effective electron temperature range up to ∼3500 K and minimum lattice temperatures of 77 K were performed using pump-probe measurements.
58
The thermal conductivity and electrical resistivity of gold from 80 to 340 K
J. G. Cook,M. P. van der Meer +1 more
TL;DR: The electrical resistivity and thermal conductivity of a sample of pure gold has been measured from 80 to 340 K using an apparatus designed for the simultaneous measurement of these properties as discussed by the authors.
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A comprehensive study of the nonlinear optical response exhibited by ion-implanted silica plates with Au and Pt nanostructures
M.A. Hernández-Acosta,Carlos Torres-Torres,J. Bornacelli,J. A. García-Merino,B. Can-Uc,Raúl Rangel-Rojo,Alicia Oliver +6 more
- 01 Aug 2021
TL;DR: In this article, the third-order nonlinear optical properties exhibited by platinum nanoclusters and gold nanoparticles integrated in a two-stage configuration are reported, which highlight the potential for tailoring quantum systems by integration of hybrid photonic circuits using multi-implantation processes.
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Direct measurements of the transport of nonequilibrium electrons in gold films with different crystal structures.
TL;DR: The experiment suggests that thermal equilibrium among the excited electrons is not fully established in the first \ensuremath{\sim}500 fs after excitation, and suggests that interactive transport mechanism is dominant at the upper end of the thickness range.