Probing interlayer interaction via chiral phonons in layered honeycomb materials
Probing interlayer interaction via chiral phonons in layered honeycomb materials
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DOI：
10.1103/physrevb.103.035405
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发表时间：
2021-01
影响因子：
3.7
通讯作者：
Chen Chen-Chen;Xiaolong Chen;Bingchen Deng;Kenji Watanabe;T. Taniguchi;Shengxi Huang;F. Xia
中科院分区：
文献类型：
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作者：
Chen Chen-Chen;Xiaolong Chen;Bingchen Deng;Kenji Watanabe;T. Taniguchi;Shengxi Huang;F. Xia
货车德瓦尔斯（vdW）相互作用在控制层状材料的物理性质方面起着重要作用。通常，vdW层间相互作用可以通过密度泛函理论计算或通过量子电容测量实验表征。在这里，我们报告的探测层间相互作用的层状蜂窝材料通过手征声子。通过螺旋度分辨的拉曼测量，我们观察到的拉曼$G$模式的手征随层数的增加而减少。我们在传统的拉曼$G$模张量中引入层间耦合项来模拟拉曼谱中的约化声子手征。我们的拉曼张量计算结果与实验结果吻合较好，表明层间相互作用可以显著影响晶格振动。我们的演示提供了一个角度来表征蜂窝晶格结构的VDW层状材料的层间相互作用。
van der Waals (vdW) interaction plays a significant role in controlling the physical properties of layered materials. Typically, the vdW interlayer interaction can be calculated by density functional theory or experimentally characterized by quantum capacitance measurement. Here, we report the probing of the interlayer interaction in layered honeycomb materials via chiral phonons. Through helicity resolved Raman measurements, we observed a reduced chirality of the Raman $G$ mode with increasing layer numbers. We introduced interlayer coupling terms into the traditional Raman $G$ mode tensor to simulate the reduced phonon chirality in Raman spectra. Our Raman tensor calculation results agree with the experiments well, suggesting that the interlayer interaction can significantly influence the lattice vibration. Our demonstration provides a perspective for characterizing the interlayer interactions in vdW layered materials with honeycomb lattice structure.