Strain-tunable van der Waals interactions in few-layer black phosphorus

Shenyang Huang, Guowei Zhang, Fengren Fan, Chaoyu Song, Fanjie Wang, Qiaoxia Xing, Chong Wang, Hua Wu and Hugen Yan ()
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Shenyang Huang: Fudan University
Guowei Zhang: Fudan University
Fengren Fan: Fudan University
Chaoyu Song: Fudan University
Fanjie Wang: Fudan University
Qiaoxia Xing: Fudan University
Chong Wang: Fudan University
Hua Wu: Fudan University
Hugen Yan: Fudan University

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Interlayer interactions in 2D materials, also known as van der Waals (vdWs) interactions, play a critical role in the physical properties of layered materials. It is fascinating to manipulate the vdWs interaction, and hence to “redefine” the material properties. Here, we demonstrate that in-plane biaxial strain can effectively tune the vdWs interaction of few-layer black phosphorus with thickness of 2-10 layers, using infrared spectroscopy. Surprisingly, our results reveal that in-plane tensile strain efficiently weakens the interlayer coupling, even though the sample shrinks in the vertical direction due to the Poisson effect, in sharp contrast to one’s intuition. Moreover, density functional theory (DFT) calculations further confirm our observations and indicate a dominant role of the puckered lattice structure. Our study highlights the important role played by vdWs interactions in 2D materials during external physical perturbations.

Date: 2019
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DOI: 10.1038/s41467-019-10483-8

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