科研之友
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摘要
We show that the high harmonics generation (HHG) in quantum dot structures can be changed from only odd orders to both odd and even orders by controlling the coupling parameters. We find that even harmonics cannot be generated in a multilevel system if the electronic levels can be classified into groups by the parity of oscillation modes (the Fourier components of Floquet states) and the radiative transitions within same group are forbidden. Otherwise both odd and even harmonics are possible. According to the two distinct dynamic behaviors of HHG, we obtain a straightforward judgement of HHG in any multilevel systems.
- 出版日期2010-9-2
- 单位北京应用物理与计算数学研究所; 清华大学
