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Detailed analysis of the commensurability oscillation (CO) has been performedon unidirectional lateral superlattices with periods ranging from a=92 to 184nm. Fourier analysis reveals the second (and the third) harmonics along withthe fundamental oscillation for a>=138 nm (184 nm) at low-enough temperature,evincing the presence of corresponding harmonics in the profile of thepotential modulation. The harmonics manifest themselves in CO with demagnifiedamplitude due to the low-pass filtering action of the thermal damping factor;with a suitable consideration of the damping effect, the harmonics of themodulation potential are found to have the amplitudes V_2 and V_3 up to roughly30% of that of the fundamental component V_1, despite the small ratio of theperiod a to the depth d = 99 nm of the two-dimensional electron gas (2DEG) fromthe surface. The dependence of V_n on a indicates that the fundamentalcomponent originates at the surface, while the higher harmonics arise from theeffect of the strain that penetrates down into subsurface. The manipulation ofhigh harmonics thus provides a useful technique to introduce small length-scalemodulation into high-mobility 2DEGs located deep inside the wafer.Comment: 9 pages, 5 figure

Harmonic Content of Strain-induced Potential Modulation in Unidirectional Lateral Superlattices