首页|Unusual photocarrier and coherent phonon dynamics behaviors of layered PdSe2 unveiled by ultrafast spectroscopy of the edge surface

Unusual photocarrier and coherent phonon dynamics behaviors of layered PdSe2 unveiled by ultrafast spectroscopy of the edge surface

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Layered materials exhibit different electronic and phonon properties along in-plane and out-of-plane directions;existing studies focus on their in-plane behaviors,and the influence of such anisotropies on the dynamics of photocarriers and phonons is unknown.Here,we fabricate layered PdSe2 crystals with flat edge surfaces and compare the time-resolved ultrafast spectro-scopies on their basal and edge surfaces.Pronounced differences in the transient reflection spectroscopies reveal the inconsistent photocarrier and phonon dynamics behaviors on the two surfaces:the slow hot carrier relaxation process is accelerated and the thermoelasticity-induced longitudinal coherent acoustic phonon oscillation completely vanishes on the edge surface,as com-pared with the basal surface.Theoretical analysis reveals that the inconsistent hot carrier dynamics originate from the anisotropic properties of low-energy phonons in PdSe2,and the absence of phonon oscillation on the edge surface results from the wavevector-limited sensitivity of acoustic B1u mode.Moreover,polarization-dependent spectroscopies indicate the diverse optical anisotropies béyond the in-plane of PdSe2.This work provides a new method to explore unique physical properties and modulate the optical anisotropy of layered materials.

PdSe2ultrafast spectroscopyedge surfacecarrier dynamicscoherent phonon oscillationanisotropy

Tiantian Yun、Changfu Huo、Jinluo Cheng、Zhi-Bo Liu、Xiao-Qing Yan

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Key Laboratory of Weak-Light Nonlinear Photonics,Ministry of Education,School of Physics,Nankai University,Tianjin 300071,China

Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China

Key Laboratory of Weak-Light Nonlinear Photonics,Ministry of Education,School of Physics,Nankai University,Tianjin,300071,China

GPL Photonics Laboratory,Key Laboratory of Luminescence Science and Technology Chinese Academy ofSciences & State Key Laboratory of Luminescence Science and Applications,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Tianjin CityFundamental Research Funds for the Central Universities-Nankai University

120742021217420722JCYBJC0039063231065

2024

10.1007/s11433-024-2401-1

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(8)