期刊
ADVANCED MATERIALS
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202306330
关键词
2D materials; Berry curvature dipoles; second-harmonic generation; tellurium; weyl semiconductors
2D Tellurene (2D Te) exhibits a strong nonlinear optical response in the infrared region due to its unique structure, making it a promising candidate for efficient nonlinear semiconductors. The large second-order nonlinear optical susceptibility (chi(2)) of 2D Te is significantly higher than that of other 2D materials, reaching a peak value at approximately 2300 nm. The exceptional performance is attributed to the presence of large Berry curvature dipole (BCD) located at the Weyl points of 2D Te.
Due to its inversion-broken triple helix structure and the nature of Weyl semiconductor, 2D Tellurene (2D Te) is promising to possess a strong nonlinear optical response in the infrared region, which is rarely reported in 2D materials. Here, a giant nonlinear infrared response induced by large Berry curvature dipole (BCD) is demonstrated in the Weyl semiconductor 2D Te. Ultrahigh second-harmonic generation response is acquired from 2D Te with a large second-order nonlinear optical susceptibility (chi(2)), which is up to 23.3 times higher than that of monolayer MoS2 in the range of 700-1500 nm. Notably, distinct from other 2D nonlinear semiconductors, chi(2) of 2D Te increases extraordinarily with increasing wavelength and reaches up to 5.58 nm V-1 at approximate to 2300 nm, which is the best infrared performance among the reported 2D nonlinear materials. Large chi(2) of 2D Te also enables the high-intensity sum-frequency generation with an ultralow continuous-wave (CW) pump power. Theoretical calculations reveal that the exceptional performance is attributed to the presence of large BCD located at the Weyl points of 2D Te. These results unravel a new linkage between Weyl semiconductor and strong optical nonlinear responses, rendering 2D Te a competitive candidate for highly efficient nonlinear 2D semiconductors in the infrared region. Giant mid-infrared second-harmonic generation performance (better than the visible region) is demonstrated in the newly discovered Weyl semiconductor -2D Te. Theoretical calculations reveal that it originated from the large Berry curvature dipole near the Weyl points of 2D Te. Therefore, even excited by continuous-wave laser, strong sum-frequency generation can be obtained in 2D Te.image
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据