UnusualphotocarrierandcoherentphonondynamicsbehaviorsoflayeredPdSe2unveiledbyultrafastspectroscopyoftheedgesurface<iclass="icon-zqcb"></i>

被引：0

作者：

Tiantian Yun ^{[1
,2
]}

Changfu Huo ^{[1
]}

Jinluo Cheng ^{[3
]}

ZhiBo Liu ^{[1
,2
]}

XiaoQing Yan ^{[1
,2
]}

机构：

[1] Key Laboratory of Weak-Light Nonlinear Photonics,Ministry of Education,School of Physics,Nankai University

[2] Collaborative Innovation Center of Extreme Optics,Shanxi University

[3] GPL Photonics Laboratory,Key Laboratory of Luminescence Science and Technology,Chinese Academy of Sciences & State Key Laboratory of Luminescence Science and Applications,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences

来源：

ScienceChina(Physics,Mechanics&Astronomy) | 2024年 / 08期

关键词：

D O I：

暂无

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

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 spectroscopies 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 compared 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 beyond the in-plane of PdSe2. This work provides a new method to explore unique physical properties and modulate the optical anisotropy of layered materials.

引用

页码：147 / 156

页数：10