Ultrafast Photogalvanic Effect in Ferromagnet/Dirac Semimetal Heterostructures Diagnosed by Terahertz Emission Spectroscopy

Guo, Y.; Chen, Z.; Cai, M.; Jin, Z.; Wang, X.; Zhang, C.; Balakin, A.V.; Shkurinov, A.P.; Peng, Y.; Zhu, Y.; Zhuang, S.

Авторы: Guo Yingyu, Chen Zhongqiang, Cai Miao, Jin Zuanming, Wang Xuefeng, Zhang Chao, Balakin Alexei V., Shkurinov Alexander P., Peng Yan, Zhu Yiming, Zhuang Songlin
Журнал: ACS Photonics
Том: 13
Номер: 5
Год издания: 2026
Издательство: American Chemical Society
Местоположение издательства: United States
Первая страница: 1330
Последняя страница: 1342
Номер статьи: acsphotonics.5c02407
DOI: 10.1021/acsphotonics.5c02407
Аннотация: Topological materials featuring spin-momentum-locked surface states and high spin-to-charge conversion (SCC) efficiency represent ideal alternatives to the nonmagnetic layer in conventional ferromagnetic (FM)/ nonmagnetic spintronic terahertz (THz) emitters. In this study, we utilized time-domain THz emission spectroscopy (TES) to investigate the free-space THz radiation characteristics of the type-II topological Dirac semimetal PdTe2/PdTe and CoFeB/PdTe2/PdTe heterostructures. The contributions of ultrafast demagnetization induced charge current (UDC) and nonlinear photocurrents were distinguished by modulating the external magnetic field and the polarization state of the excitation laser. Experimental analysis reveals that the UDC of CoFeB/ PdTe2/PdTe acts as the primary mechanism for THz generation, whereas the nonlinear effects within the PdTe2/PdTe heterostructure enable the additional polarization-dependent control of THz emission. The polarization dependence of the observed nonlinear photocurrents in the CoFeB/PdTe2/PdTe heterostructure aligns with the photogalvanic effects (PGE) arising from the combination of spin photocurrent and shift current in PdTe2/PdTe. The polarization-controlled photocurrent modulation demonstrated in this work offers critical insights for the development of advanced, ultrafast, and tunable THz devices based on topological Dirac systems.
Добавил в систему: Балакин Алексей Вячеславович

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Ultrafast Photogalvanic Effect in Ferromagnet/Dirac Semimetal Heterostructures Diagnosed by Terahertz Emission Spectroscopyстатья Исследовательская статья

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