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Ultrafast photothermoelectric effect in Dirac semimetallic Cd3As2 revealed by terahertz emission

Author

Listed:
  • Wei Lu

    (Tianjin University
    Peking University)

  • Zipu Fan

    (Peking University)

  • Yunkun Yang

    (Fudan University)

  • Junchao Ma

    (Peking University)

  • Jiawei Lai

    (Peking University)

  • Xiaoming Song

    (Tianjin University)

  • Xiao Zhuo

    (Peking University)

  • Zhaoran Xu

    (Peking University)

  • Jing Liu

    (Tianjin University)

  • Xiaodong Hu

    (Tianjin University)

  • Shuyun Zhou

    (Tsinghua University
    Collaborative Innovation Center of Quantum Matter)

  • Faxian Xiu

    (Fudan University)

  • Jinluo Cheng

    (Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences)

  • Dong Sun

    (Peking University
    Collaborative Innovation Center of Quantum Matter)

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 (~0.4 T) 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.

Suggested Citation

  • Wei Lu & Zipu Fan & Yunkun Yang & Junchao Ma & Jiawei Lai & Xiaoming Song & Xiao Zhuo & Zhaoran Xu & Jing Liu & Xiaodong Hu & Shuyun Zhou & Faxian Xiu & Jinluo Cheng & Dong Sun, 2022. "Ultrafast photothermoelectric effect in Dirac semimetallic Cd3As2 revealed by terahertz emission," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-29168-w
    DOI: 10.1038/s41467-022-29168-w
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    References listed on IDEAS

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    3. Zhenzhao Jia & Caizhen Li & Xinqi Li & Junren Shi & Zhimin Liao & Dapeng Yu & Xiaosong Wu, 2016. "Thermoelectric signature of the chiral anomaly in Cd3As2," Nature Communications, Nature, vol. 7(1), pages 1-6, December.
    4. Lukas Braun & Gregor Mussler & Andrzej Hruban & Marcin Konczykowski & Thomas Schumann & Martin Wolf & Markus Münzenberg & Luca Perfetti & Tobias Kampfrath, 2016. "Ultrafast photocurrents at the surface of the three-dimensional topological insulator Bi2Se3," Nature Communications, Nature, vol. 7(1), pages 1-9, December.
    5. Fei Han & Nina Andrejevic & Thanh Nguyen & Vladyslav Kozii & Quynh T. Nguyen & Tom Hogan & Zhiwei Ding & Ricardo Pablo-Pedro & Shreya Parjan & Brian Skinner & Ahmet Alatas & Ercan Alp & Songxue Chi & , 2020. "Quantized thermoelectric Hall effect induces giant power factor in a topological semimetal," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
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    Cited by:

    1. Bing Cheng & Di Cheng & Tao Jiang & Wei Xia & Boqun Song & Martin Mootz & Liang Luo & Ilias E. Perakis & Yongxin Yao & Yanfeng Guo & Jigang Wang, 2024. "Chirality manipulation of ultrafast phase switches in a correlated CDW-Weyl semimetal," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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