布里渊区
电子
高次谐波产生
谐波
边界(拓扑)
原子物理学
物理
材料科学
凝聚态物理
激光器
光学
量子力学
数学分析
数学
作者
Jun Luo,Bin Yuan,Jiajun Xiao,Xi Liu,Zhongyi Jiang,Yang Li
标识
DOI:10.1088/1402-4896/ad3174
摘要
Abstract We propose a novel mechanism to manipulate the electron dynamics at the boundary of the Brillouin zone (BZ) through resonant excitation induced by ultraviolet (UV) laser pulses in solid high harmonic generation (HHG). 
When adding weak UV pulses to a stronger mid-infrared (MIR) driving field, we show that UV pulses with specific wavelengths generate a resonant excitation zone around the $\Gamma$ point in $k-$space, which facilitates the interband transition of electrons in the BZ boundary region. The scheme is not only significant for achieving higher harmonic yield, but also exhibits strong robustness at a relatively low MIR driving intensity due to the inherent manipulation of UV pulses for interband dynamics of BZ boundary electrons. The semiclassical four-step model is adopted to elucidate underlying physics.
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