TY - GEN
T1 - Spin-layer locking induced second-order nonlinear effect in centrosymmetric crystals
AU - Zhao, Yanchong
AU - Du, Luojun
AU - Liang, Jing
AU - Bahramy, Mohammad
AU - Yang, Mingwei
AU - Guang, Yao
AU - Wei, Zheng
AU - Liao, Mengzhou
AU - Tang, Jian
AU - Zhao, Jiaojiao
AU - Shen, Cheng
AU - Li, Xiaomei
AU - Wang, Qinqin
AU - Yang, Rong
AU - Shi, Dongxia
AU - Liu, Kaihui
AU - Sun, Zhipei
AU - Zhang, Guangyu
PY - 2020/12/29
Y1 - 2020/12/29
N2 - According to the generally accepted nonlinear principles, second-order nonlinear effect (SONE) is strongly inhibited by the crystalline symmetries and thus can manifest only in non-centrosymmetric materials with broken global spatial inversion symmetry. In stark contrast, here we report the observation of direct-current (DC) related SONE, including circular and linear photogalvanic effects, in centrosymmetric bilayer and multilayer MoS2. In conjunction with relativistic first-principles calculations, we uncover that the observed DC-related SONE in inversion-symmetric MoS2 results from the localized electronic states and the locking of spin with the layer and valley pseudospins. Our results provide a new insight into nonlinear physics and would be applicable to other phenomena thus far believed to occur only in non-centrosymmetric systems, such as quantum spin Hall effect, valley Hall effect, piezoelectricity and unconventional Ising superconductivity.
AB - According to the generally accepted nonlinear principles, second-order nonlinear effect (SONE) is strongly inhibited by the crystalline symmetries and thus can manifest only in non-centrosymmetric materials with broken global spatial inversion symmetry. In stark contrast, here we report the observation of direct-current (DC) related SONE, including circular and linear photogalvanic effects, in centrosymmetric bilayer and multilayer MoS2. In conjunction with relativistic first-principles calculations, we uncover that the observed DC-related SONE in inversion-symmetric MoS2 results from the localized electronic states and the locking of spin with the layer and valley pseudospins. Our results provide a new insight into nonlinear physics and would be applicable to other phenomena thus far believed to occur only in non-centrosymmetric systems, such as quantum spin Hall effect, valley Hall effect, piezoelectricity and unconventional Ising superconductivity.
KW - nonlinear principles
KW - second-order nonlinear effect 29 (SONE)
UR - https://doi.org/10.21203/rs.3.rs-126567/v1
U2 - 10.21203/rs.3.rs-126567/v1
DO - 10.21203/rs.3.rs-126567/v1
M3 - Other contribution
ER -