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Second harmonic generation in atomically thin MoTe2

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arxiv 1805.09489 v1 pith:XVNF4FIW submitted 2018-05-24 physics.optics cond-mat.mes-hall

Second harmonic generation in atomically thin MoTe2

Yu Song , Ruijuan Tian , Jiulong Yang , Rui Yin , Jianlin Zhao , Xuetao Gan This is my paper
classification physics.optics cond-mat.mes-hall
keywords mote2h-mote2atomicallyharmonicmonolayersecondshgsthin
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We have studied on optical second harmonic generations (SHGs) from atomically thin MoTe2 flakes with 2H and 1T' phases. From 2H-MoTe2 samples with odd (even) numbers of layers, strong (negligible) SHGs are observed due to the layer-dependent broken inversion symmetry. When pumped by a telecom-band laser, SHG from a monolayer 2H-MoTe2 is about one order of magnitude stronger than that from a monolayer WS2; an extremely high second-order nonlinear susceptibility of 2.5 nm/V is estimated, presenting the highest value among those reported in two-dimensional materials. SHG measurements in MoTe2 are also demonstrated as an efficient way to distinguish the 2H-to-1T' phase transition. Comparing to the SHG in 2H-MoTe2, 1T'-MoTe2's SHG has much lower efficiency and the polarization dependence is changed from six-fold to two-lobe pattern.

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