Nonlinear optical absorption and ultrafast carrier's dynamics of ZrTe2 by Transient Absorption (TA) Spectrometer
Nonlinear optical absorption and ultrafast carrier's dynamics of ZrTe2 by Transient Absorption (TA) Spectrometer
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利用瞬态吸收 (TA) 光谱仪研究 ZrTe2 的非线性光吸收和超快载流子动力学
DOI：
10.1016/j.optmat.2022.112730
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发表时间：
2022-10
期刊：
影响因子：
--
通讯作者：
Yanqi Ge
中科院分区：
文献类型：
--
作者：
Ahmed Shakeel;Wang Rui;Faizah Altaf;None Jahanzeb khan;Ahmed A. Al-Ghamdi;Wageh Swelm;Yanqi Ge
TMDCs（过渡金属二硫族化合物）家族为各种器件应用提供了一个发现新的物理现象和奇异电子特性的平台。ZrTe 2样品的超快载流子动力学表明，瞬态吸收（TA）信号具有（电子-空穴）成分和陷阱载流子。TA的变化取决于载流子性质和空间局域激发引起的光激发。在宽带中，正信号来自激发态吸收，负信号来自基态吸收。可以看出，由于影响相关的非线性吸收（NLA）， ESA比GSA更大。为了研究ZrTe 2的TA激子动力学，我们将正探针漂白剂（PB）归为位于高激子态的热激子。功率依赖性衰变的TA表明，自俘获激子（STE）和自由激子（FE）都有三个过程，即ST激子从F激子弛豫，激子-激子之间的湮灭过程和ST激子的基态弛豫。激子湮灭速率的变化给出了激子动力学的准确信息，这是瞬态吸收光谱的关键方面。自由载流子在很大程度上是局域的，与非局域的捕获载流子相比，它们的移动速度更快。•研究了ZrTe 2样品的超快载流子动力学。•样品表明瞬态吸收（TA）信号具有（电子-空穴）成分和陷阱载流子。•宽带中的正信号来自ESA（激发态吸收），负信号来自GSA（基态吸收）。•由于与影响相关的非线性吸收（NLA）， ESA比GSA更大。•激子湮灭率的变化给出了激子动力学的准确信息，这是瞬态吸收光谱的关键方面。
The TMDCs (transition metal di-chalcogenides) family provides a platform to discover novel physical phenomena and exotic electronic properties for various device applications. The ultrafast carrier dynamics of the ZrTe 2 sample demonstrate that Transient absorption (TA) signals have (electron-hole) constituents and trap carriers. TA variations depend upon carrier properties and photo-excitation due to spatially localized excitations. In the broadband positive signal obtain from ESA (Excited-State Absorption) and the negative signal from GSA (Ground State Absorption). It is seen that ESA is greater as compared to GSA due to fluence-dependent nonlinear absorption (NLA). To study the TA excitons dynamics of ZrTe 2 , we attribute positive probe bleach (PB) as hot excitons that are situated at higher excitonic states. The TA from power-dependent decay demonstrates that both types of excitons self-trapped excitons (STE) and free excitons (FE) have three processes, relaxation of ST excitons from F excitons, annihilation process between exciton-exciton and relaxation of the ground state from ST excitons states. The variation in exciton annihilation rate gives the exact information about exciton dynamics, which is the key aspect of transient absorption spectroscopy. The free charge carriers are largely localized and move faster compared to the non-localized trapped charge carriers. • The ultrafast carrier dynamics of the ZrTe 2 sample were done. • The sample showed that Transient absorption (TA) signals have (electron-hole) constituents and trap carriers. • In the broadband positive signal obtain from ESA (Excited-State Absorption) and the negative signal from GSA (Ground State Absorption). • The ESA is greater as compared to GSA due to fluence-dependent nonlinear absorption (NLA). • The variation in exciton annihilation rate gives the exact information about exciton dynamics, which is the key aspect of transient absorption spectroscopy.
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