Investigation of Nonequilibrium Electronic Dynamics of Warm Dense Copper with Femtosecond X-Ray Absorption Spectroscopy

Lee, Jun Young; Kim, Min-Ju; Kang, Gil Bu; Vinko, S. M.; Bae, Leejin; Cho, Min Sang; Chung, H.‐K.; Kim, Minseok; Kwon, Soonnam; Lee, Gyusang; Nam, Chang Hee; Park, Sang Han; Sohn, Jang Hyeob; Yang, Seong Hyeok; Zastrau, U.; Cho, Byoung Ick

doi:10.1103/physrevlett.127.175003

Cited by 15 publications

(12 citation statements)

References 37 publications

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“…If the initial state is a solid, the lattice is heated due to electron–phonon energy transfer to a new thermal equilibrium over several (tens to hundreds of) picoseconds. During this evolution, many interesting effects such as the ultrafast electron and non-equilibrium phonon dynamics [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ], changes in lattice stability [ 20 , 21 , 22 , 23 , 24 ], phase transitions [ 25 , 26 , 27 , 28 , 29 , 30 ], and non-equilibrium electron–phonon interactions [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ] take place. It should be pointed out that these various physical processes are all driven by electronic excitations.…”

Section: Introductionmentioning

confidence: 99%

Energy Relaxation and Electron–Phonon Coupling in Laser-Excited Metals

et al. 2022

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The rate of energy transfer between electrons and phonons is investigated by a first-principles framework for electron temperatures up to Te = 50,000 K while considering the lattice at ground state. Two typical but differently complex metals are investigated: aluminum and copper. In order to reasonably take the electronic excitation effect into account, we adopt finite temperature density functional theory and linear response to determine the electron temperature-dependent Eliashberg function and electron density of states. Of the three branch-dependent electron–phonon coupling strengths, the longitudinal acoustic mode plays a dominant role in the electron–phonon coupling for aluminum for all temperatures considered here, but for copper it only dominates above an electron temperature of Te = 40,000 K. The second moment of the Eliashberg function and the electron phonon coupling constant at room temperature Te=315 K show good agreement with other results. For increasing electron temperatures, we show the limits of the T=0 approximation for the Eliashberg function. Our present work provides a rich perspective on the phonon dynamics and this will help to improve insight into the underlying mechanism of energy flow in ultra-fast laser–metal interaction.

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Section: Introductionmentioning

confidence: 99%

Energy Relaxation and Electron–Phonon Coupling in Laser-Excited Metals

et al. 2022

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“…236 Thus, we believe that cumulative applications of these characterization techniques will be able to solve various issues of LIB. Since, still there are numerous challenges to exactly identifying the structural behaviour of NCM cathode surface, hence, the techniques such as single-shot coherent X-ray imaging 237 and transient X-ray absorption spectroscopy 238,239 developed at 4 th generation synchrotron facility may be effective. 240 However, the use of these techniques for battery research are in infant stages till date.…”

Section: Tomographymentioning

confidence: 99%

Synchrotron radiation based X-ray techniques for analysis of cathodes in Li rechargeable batteries

et al. 2022

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“…This is adequate to describe the evolution of x-ray-irradiated samples on femtosecond timescales, but starts to breakdown as the ions are heated. However, ion heating takes place on longer picosecond timescales, normally dictated by electron-phonon coupling dynamics [10,[24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Non-thermal evolution of dense plasmas driven by intense x-ray fields

Ren¹,

Shi²,

Berg³

et al. 2022

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The advent of x-ray free-electron lasers (XFELs) has enabled a range of new experimental investigations into the properties of matter driven to extreme conditions via intense x-ray-matter interactions. The femtosecond timescales of these interactions lead to the creation of transient high-energy-density plasmas, where both the electrons and the ions may be far from local thermodynamic equilibrium (LTE). Predictive modelling of such systems remains challenging because of the substantially different timescales on which electrons and ions thermalize, and because of the vast number of atomic configurations that are required to describe the resulting highly-ionized plasmas.Here we explore the evolution of systems driven to high energy densities using CCFLY, a non-LTE, Fokker-Planck collisional-radiative code. We use CCFLY to investigate the evolution dynamics of a solid-density plasma driven by an XFEL, and explore the relaxation of the plasma to local thermodynamic equilibrium on femtosecond timescales in terms of the charge state distribution, electron density, and temperature.

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Investigation of Nonequilibrium Electronic Dynamics of Warm Dense Copper with Femtosecond X-Ray Absorption Spectroscopy

Cited by 15 publications

References 37 publications

Energy Relaxation and Electron–Phonon Coupling in Laser-Excited Metals

Energy Relaxation and Electron–Phonon Coupling in Laser-Excited Metals

Synchrotron radiation based X-ray techniques for analysis of cathodes in Li rechargeable batteries

Non-thermal evolution of dense plasmas driven by intense x-ray fields

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