Colossal mid-infrared bulk photovoltaic effect in a type-I Weyl semimetal
Colossal mid-infrared bulk photovoltaic effect in a type-I Weyl semimetal
复制标题
DOI：
10.1038/s41563-019-0297-4
复制
发表时间：
2019-05-01
期刊：
影响因子：
41.2
通讯作者：
Burch, Kenneth S.
中科院分区：
文献类型：
--
作者：
Osterhoudt, Gavin B.;Diebel, Laura K.;Burch, Kenneth S.
宽带、高效、快速的光到电的转换对于传感和清洁能源至关重要。体光伏效应（BPVE）是一种二阶非线性光学效应，本质上将光转换为电流。在这里，我们在 Weyl 半金属 TaAs 的显微器件中展示了大型中红外 BPVE。这一发现是外尔半金属、聚焦离子束制造和理论工作相结合的最新进展，表明 BPVE 和拓扑之间存在联系。我们还提出了详细的对称性分析，使我们能够将位移电流响应与光热效应分开。指定的位移电流的大小和波长范围可能会影响光学探测器、清洁能源和拓扑结构，并展示外尔半金属在实际应用中的效用。
Broadband, efficient and fast conversion of light to electricity is crucial for sensing and clean energy. The bulk photovoltaic effect (BPVE) is a second-order nonlinear optical effect that intrinsically converts light into electrical current. Here, we demonstrate a large mid-infrared BPVE in microscopic devices of the Weyl semimetal TaAs. This discovery results from combining recent developments in Weyl semimetals, focused-ion beam fabrication and theoretical works suggesting a connection between BPVE and topology. We also present a detailed symmetry analysis that allows us to separate the shift current response from photothermal effects. The magnitude and wavelength range of the assigned shift current may impact optical detectors, clean energy and topology, and demonstrate the utility of Weyl semimetals for practical applications.