Figure 2.

Characteristic phonon vibrational modes of the MoS₂/WS₂ heterobilayer under tensile and compressive strain. (a) A schematic of our bending system used to strain the heterobilayer and measure the vibrational phonon modes. (b) Evolution of the Raman spectra as the heterobilayer is strained from 0% to +0.70% (toward red, tensile) and −0.70% (toward blue, compressive). The change in the Raman in-plane E¹_2g phonon modes of WS₂ (c) and MoS₂ (d) in the heterobilayer under uniaxial tensile (red) and compressive (blue) strain.