Fangyan Gao Yonglin He Lingyu Zhang Shengpeng Zhou Jing Guo Visualization of the Preacceleration Process for High-Harmonic Generation in Solids. 1281 2022 14 Symmetry 7 https://doi.org/10.3390/sym14071281 db/journals/symmetry/symmetry14.html#GaoHZZG22