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首页> 外文期刊>Advanced Functional Materials >Lattice Dynamics, Phonon Chirality, and Spin-Phonon Coupling in 2D Itinerant Ferromagnet Fe_3GeTe_2
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Lattice Dynamics, Phonon Chirality, and Spin-Phonon Coupling in 2D Itinerant Ferromagnet Fe_3GeTe_2

机译：二维流动铁磁体Fe_3GeTe_2中的晶格动力学，声子手性和自旋声子耦合

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摘要

Fe3GeTe2 has emerged as one of the most fascinating van der Waals crystals due to its 2D itinerant ferromagnetism, topological nodal lines, and Kondo lattice behavior. However, lattice dynamics, chirality of phonons, and spin-phonon coupling in this material, which set the foundation for these exotic phenomena, have remained unexplored. Here, the first experimental investigation of the phonons and mutual interactions between spin and lattice degrees of freedom in few-layer Fe3GeTe2 is reported. The results elucidate three prominent Raman modes at room temperature: two A(1g)(Gamma) and one E-2g(Gamma) phonons. The doubly degenerate E-2g(Gamma) mode reverses the helicity of incident photons, indicating the pseudoangular momentum and chirality. Through analysis of temperature-dependent phonon energies and lifetimes, which strongly diverge from the anharmonic model below Curie temperature, the spin-phonon coupling in Fe3GeTe2 is determined. Such interaction between lattice oscillations and spin significantly enhances the Raman susceptibility, allowing to observe two additional Raman modes at the cryogenic temperature range. In addition, laser radiation-induced degradation of Fe3GeTe2 in ambient conditions and the corresponding Raman fingerprint is revealed. The results provide the first experimental analysis of phonons in this novel 2D itinerant ferromagnet and their applicability for further fundamental studies and application development.
机译：Fe3GeTe2由于其2D流动铁磁性，拓扑结线和Kondo晶格行为而成为最引人注目的范德华晶体之一。但是，这种材料的晶格动力学，声子手性和自旋声子耦合，为这些奇异现象奠定了基础，至今仍未开发。在这里，首次实验研究了几层Fe3GeTe2中的声子以及自旋和晶格自由度之间的相互作用。结果阐明了室温下三种突出的拉曼模式：两个A（1g）（γ）和一个E-2g（γ）声子。双重简并的E-2g（Gamma）模式使入射光子的螺旋度反转，表明伪角动量和手性。通过分析与温度相关的声子能量和寿命，该温度与居里温度以下的非谐模型有很大差异，从而确定了Fe3GeTe2中的自旋声子耦合。晶格振荡和自旋之间的这种相互作用显着增强了拉曼磁化率，从而允许在低温温度范围内观察到另外两个拉曼模式。另外，揭示了在环境条件下激光辐射引起的Fe3GeTe2降解以及相应的拉曼指纹。结果提供了这种新颖的2D流动铁磁体中声子的首次实验分析，及其在进一步的基础研究和应用开发中的适用性。

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