@article{oai:repo.qst.go.jp:00080256,
 author = {Sanari, Yasuyuki and Hirori, Hidek and Aharen, Tomoko and Tahara, Hirokazu and Shinohara, Yasushi and L. Ishikawa, Kenichi and Otobe, Tomohito and Xia, Peiyu and Ishii, Nobuhisa and Itatani, Jiro and A. Sato, Shunsuke and Kanemitsu, Yoshihiko and Otobe, Tomohito},
 journal = {Physical Review B},
 month = {Jul},
 note = {We study sub-bandgap high harmonic generation (HHG) from a single crystal of perovskite semiconductor, methylammonium lead chloride (MAPbCl3), which has strong and anisotropic optical nonlinearity. We observed anisotropy in the crystal orientation dependence of the high harmonics yield, which in turn varies substantially with the electric field strength of mid-infrared laser pulse for excitation. Our real-time ab initio simulations well reproduce the experimental results. From decomposition analysis of the intraband current, we reveal that strongly nonlinear virtual population dynamics, causing no permanent excited carriers, rather than the anharmonic potential in the band structure is mainly responsible for HHG.},
 pages = {041125(R)-1--041125(R)-7},
 title = {Role of Nonlinear Virtual Population for High Harmonic Generation in Solids},
 volume = {102},
 year = {2020}
}