首页|Hybridization-mediated quasiparticle and phonon dynamics in single crystal cerium films

Hybridization-mediated quasiparticle and phonon dynamics in single crystal cerium films

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We report the ultrafast optical pump-probe spectroscopy measurements on the single-crystal cerium films.Our experimental re-sults of temperature-dependent quasiparticle dynamics reveal development of the hybridization between localized f moments and conduction electrons,i.e.,evolving from fluctuating hybridization to collective hybridization.Exotic phonon renormaliza-tion is discovered to appear at the emerging temperature(T+)of fluctuating hybridization apart from its known presence at the coherent temperature(T*),and can hardly be explained by the mean-field theory.The quasiparticle relaxation at high temper-atures indicates coexistence of nonthermal electron-electron scattering and inelastic Kondo scattering,while its behavior at low temperatures suggests onset of a phase in the y-phase dominated film.We also extract the indirect gap below T*,representing the appearance of collective hybridization.Our findings provide novel information about the hybridization and phase evolution in the heavy fermion systems.

ceriumquasiparticle dynamicshybridizationphonon renormalization

Yunhe Pei、Yi Wu、Kai Hu、Zhengxing Wei、YiFeng Yang、Yang Liu、Jingbo Qi

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State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China,Chengdu 611731,China

Center for Correlated Matter and Department of Physics,Zhejiang University,Hangzhou 310058,China

Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

University of Chinese Academy of Sciences,Beijing 100049,China

Songshan Lake Materials Laboratory,Dongguan 523808,China

Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China

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国家重点研发计划国家重点研发计划国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金Frontier Science Project of Dongguan

2022YFA14030002022YFA140220092365102119740701173400611925408119210041200406762027807121743312019622101004

2024

10.1007/s11433-023-2289-0

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(4)
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