Second-harmonic generation in atomically thin
1T−TiSe2
and its possible origin from charge density wave transitions
Ruiming Zhang, Wei Ruan, Junyao Yu, Libo Gao, Helmuth Berger, László Forró, Kenji Watanabe, Takashi Taniguchi, Ahmad Ranjbar, Rodion V. Belosludov, Thomas D. Kühne, Mohammad Saeed Bahramy, Xiaoxiang Xi.