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

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.

arXiv comment23 pages, 3 figures

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Cited by in corpus (16)

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• The Optical Properties and Plasmonics of Anisotropic 2-Dimensional Materials
• Tunable intraband optical conductivity and polarization-dependent epsilon-near-zero behavior in black phosphorus
• Prediction of hyperbolic exciton-polaritons in monolayer black phosphorus
• The optical conductivity of few-layer black phosphorus by infrared spectroscopy
• Microheater actuators as a versatile platform for strain engineering in 2D materials
• Giant piezoresistive effect and strong band gap tunability in ultrathin InSe upon biaxial strain
• Layer-dependent pressure effect on electronic structures of 2D black phosphorus
• From Anomalous to Normal: Temperature Dependence of the Band Gap in Two-Dimensional Black Phosphorus
• Biaxial strain tuning of interlayer excitons in bilayer MoS2
• Anisotropic Infrared Response and Orientation-dependent Strain-tuning of the Electronic Structure in Nb2SiTe4
• Role of Interlayer Coupling in the Second Harmonic Generation of Bilayer Transition-metal Dichalcogenides
• Strong effects of uniaxial pressure and short-range correlations in Cr2Ge2Te6
• Room temperature ferromagnetic semiconductors through metal-semiconductor transition in monolayer MnSe2
• Berry Curvature Dipole and its Strain Engineering in Layered Phosphorene
• Controlling electric and magnetic Purcell effects in phosphorene via strain engineering