Third harmonic enhancement due to Fano interference in semiconductor quantum well

We investigate the emission spectra of the semiconductor quantum well for few-cycle and sub-cycle pulse exciting. We find that Fano interference may induce third harmonic enhancement. Third harmonic enhancement varies with the magnitude and duration of the incident pulse, and may be enhanced by approximately one order of magnitude for the low intensity region of the sub-cycle incident pulse exciting.

National Natural Sciences Foundation of China [60708008, 10734080]; Project of Academic Leaders in Shanghai [07XD14030]; Knowledge Innovation Program of the Chinese Academy of Sciences ; Youth Foundation of Nanjing University of Aeronautics and Astronautics