FIG. 2.

(color online). Amplitude of the SAW nonvanishing strains vs depth for a surface displacement of 1 pm at a frequency of 1 GHz. ${\epsilon }_{xx}$ (solid red line) and ${\epsilon }_{zz}$ (dash-dotted green line) are proportional to $\text{sin}\left(kx-{\omega }_{s}t\right)$, while ${\epsilon }_{xz}$ (dashed blue line) is proportional to $\cos \left(kx-{\omega }_{s}t\right)$. Here $k=2\pi /{\lambda }_s$ and ${\omega }_s=2\pi {\nu }_s$. The black arrow corresponds to the sample parameters described in this Letter: a SAW wavelength of ${\lambda }_s=2\pi /k=2.9\mu \text{m}$ and a QD depth of z = 1.5 μm.