Ultrafast photothermoelectric effect in Dirac semimetallic Cd3As2 revealed by terahertz emission

doi:10.1038/s41467-022-29168-w

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	Ultrafast photothermoelectric effect in Dirac semimetallic Cd3As2 revealed by terahertz emission
	W. Lu; Z. P. Fan; Y. K. Yang; J. C. Ma; J. W. Lai; X. M. Song; X. Zhuo; Z. R. Xu; J. Liu; X. D. Hu; S. Y. Zhou; F. X. Xiu; J. L. Cheng and D. Sun
	2022
Source Publication	Nature Communications
Volume	13 Issue:1 Pages:9
Abstract	The thermoelectric effects of topological semimetals have attracted tremendous research interest because many topological semimetals are excellent thermoelectric materials and thermoelectricity serves as one of their most important potential applications. In this work, we reveal the transient photothermoelectric response of Dirac semimetallic Cd3As2, namely the photo-Seebeck effect and photo-Nernst effect, by studying the terahertz (THz) emission from the transient photocurrent induced by these effects. Our excitation polarization and power dependence confirm that the observed THz emission is due to photothermoelectric effect instead of other nonlinear optical effect. Furthermore, when a weak magnetic field (similar to 0.4T) is applied, the response clearly indicates an order of magnitude enhancement on transient photothermoelectric current generation compared to the photo-Seebeck effect. Such enhancement supports an ambipolar transport nature of the photo-Nernst current generation in Cd3As2. These results highlight the enhancement of thermoelectric performance can be achieved in topological Dirac semimetals based on the Nernst effect, and our transient studies pave the way for thermoelectric devices applicable for high field circumstance when nonequilibrium state matters. The large THz emission due to highly efficient photothermoelectric conversion is comparable to conventional semiconductors through optical rectification and photo-Dember effect.
DOI	10.1038/s41467-022-29168-w
URL	查看原文
Indexed By	sci ; ei
Language	英语
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Document Type	期刊论文
Identifier	http://ir.ciomp.ac.cn/handle/181722/67211
Collection	中国科学院长春光学精密机械与物理研究所
Recommended Citation GB/T 7714	W. Lu,Z. P. Fan,Y. K. Yang,et al. Ultrafast photothermoelectric effect in Dirac semimetallic Cd3As2 revealed by terahertz emission[J]. Nature Communications,2022,13(1):9.
APA	W. Lu.,Z. P. Fan.,Y. K. Yang.,J. C. Ma.,J. W. Lai.,...&J. L. Cheng and D. Sun.(2022).Ultrafast photothermoelectric effect in Dirac semimetallic Cd3As2 revealed by terahertz emission.Nature Communications,13(1),9.
MLA	W. Lu,et al."Ultrafast photothermoelectric effect in Dirac semimetallic Cd3As2 revealed by terahertz emission".Nature Communications 13.1(2022):9.

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中国科学院长春光学精密机械与物理研究所