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

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Title
Investigation of Nonequilibrium Electronic Dynamics of Warm Dense Copper with Femtosecond X-Ray Absorption Spectroscopy
Author(s)
Jong-Won Lee; Minju Kim; Gyeongbo Kang; Vinko, Sam M.; Bae, Leejin; Min Sang Cho; Chung, Hyun-Kyung; Kim, Minseok; Kwon, Soonnam; Gyusang Lee; Chang Hee Nam; Park, SangHan; Sohn, Jang Hyeob; Yang, Seong Hyeok; Zastrau, Ulf; Byoung Ick Cho
Publication Date
2021-10
Journal
Physical Review Letters, v.127, no.17
Publisher
American Physical Society
Abstract
© 2021 American Physical SocietyUltrafast optical excitation of matter leads to highly excited states that are far from equilibrium. In this study, femtosecond x-ray absorption spectroscopy was used to visualize the ultrafast dynamics in photoexcited warm dense Cu. The rich dynamical features related to vacancies are observed on femtosecond timescales. Despite the success in explaining x-ray absorption data in the picosecond regime, the new femtosecond data are poorly understood through the traditional two-temperature model based on the fast thermalization concept and the static electronic structure for high-temperature metals. An improved understanding can be achieved by including the recombination dynamics of nonthermal electrons and changes in the screening of the excited block. The population balance between the and bands is mainly determined by the recombination rate of nonthermal electrons, and the underpopulated block is initially strongly downshifted and recovered in several hundreds of femtoseconds.
URI
https://pr.ibs.re.kr/handle/8788114/10616
DOI
10.1103/PhysRevLett.127.175003
ISSN
0031-9007
Appears in Collections:
Center for Relativistic Laser Science(초강력 레이저과학 연구단) > 1. Journal Papers (저널논문)
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