Broadband Terahertz Generation via the Interface Inverse Rashba-Edelstein Effect

Zhou, Chao; Liu, Y. P.; Wang, Z.; J., S.; Jia, Mengwen; Wu, Ruqian; Zhou, Lei; Zhang, W.; Liu, M. K.; Wu, Y. Z.; Qi, J.

doi:10.1103/physrevlett.121.086801

Cited by 134 publications

(91 citation statements)

References 49 publications

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“…When the spin polarized current enters the NM layer with large spin-orbit coupling (SOC), it is converted to a charge current in the transverse direction by ISHE, thereby generating the THz wave [1,2]. On the other hand, the THz emitter based on IREE typically consists of a FM with an adjacent Rashba interface, e.g., FM/Ag/Bi [16]; in this case, the super-diffusive spin polarized current launched by the FM layer is converted to transverse charge current at the Ag/Bi interface via the IREE [11][12][13], which in the same way as the ISHE, generates the THz emission. In this letter, we examine the possibility of using anomalous Hall effect (AHE) [17] to generate THz emission in a single layer FM with a large SOC and demonstrate efficient THz emission in samples with a magnetization gradient.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Emission from Anomalous Hall Effect in a Single-Layer Ferromagnet

Zhang

Luo

et al. 2019

Phys. Rev. Applied

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We report on terahertz emission from a single layer ferromagnet which involves the generation of backflow nonthermal charge current from the ferromagnet/dielectric interface by femtosecond laser excitation and subsequent conversion of the charge current to a transverse transient charge current via the anomalous Hall effect, thereby generating the THz radiation. The THz emission can be either enhanced or suppressed, or even the polarity can be reversed, by introducing a magnetization gradient in the thickness direction of the ferromagnet. Unlike spintronic THz emitters reported previously, it does not require additional non-magnetic layer or Rashba interface.

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Section: Introductionmentioning

confidence: 99%

Terahertz Emission from Anomalous Hall Effect in a Single-Layer Ferromagnet

Zhang

Luo

et al. 2019

Phys. Rev. Applied

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“…The efficiency of THz generation is wavelength‐independent in the range of 900–1500 nm, which means that the details of the involved optical transitions are insignificant . The femtosecond spin‐current pulse can also generate THz transients at Rashba interfaces . In spite of the great perspectives in THz source and many interesting results published up to date, the capability of spintronic heterostructures as high‐performance elements to control and manipulate THz radiation waves, such as modulators and filters, is in high demand to develop communication and imaging systems …”

mentioning

confidence: 99%

Terahertz Radiation Modulated by Confinement of Picosecond Current Based on Patterned Ferromagnetic Heterostructures

Jin

Zhang

Zhu

et al. 2019

Physica Rapid Research Ltrs

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The ultrashort laser excitation of nonmagnetic/ferromagnetic/nonmagnetic (NM/FM/NM) heterostructures is intensively studied as a terahertz (THz) emitter. Herein, the combined spintronic and photonic ultrathin metal heterostructures are exploited to realize actively modulated THz radiation. It is demonstrated that the THz radiation can be mediated coherently through the charge current induced by the inverse spin Hall effect (ISHE) and the built‐in transient current quasi‐simultaneously created within the striped NM/FM/NM heterostructures. The waveforms of THz radiation can be shaped by the charge current confinement effect, including the amplitude modulation and the center‐frequency shift. These findings can be utilized for device‐oriented opto‐spintronics and also extend the established THz emitter to THz modulator.

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“… Here we focus on the enhancement based on PhC structure, where the multiple scatterings and interferences can be tailored by adjusting the thickness of the period ( d ) and the number of repeats ( n ). Transfer‐matrix method is employed for the theoretical calculations and the structure design, which has been proved to be an efficient tool …”

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confidence: 99%

Highly Efficient Spintronic Terahertz Emitter Enabled by Metal–Dielectric Photonic Crystal

Feng¹,

Zhou

et al. 2018

Advanced Optical Materials

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Spintronic terahertz (THz) emitter provides the advantages such as apparently broader spectrum, significantly lower cost, and more flexibility compared with the commercial THz emitters, and thus attracts great interest recently. In past few years, efforts have been made in optimizing the material composition and structure geometry, and the conversion efficiency has been improved close to that of ZnTe crystal. One of the drawbacks of the current designs is the rather limited laser absorption—more than 50% energy is wasted and the conversion efficiency is thus limited. Here, a novel device that fully utilizes the laser intensity and significantly improves the conversion efficiency is theoretically proposed and experimentally demonstrated. The device, which consists of a metal–dielectric photonic crystal structure, utilizes the interference between the multiple scattering waves to simultaneously suppress the reflection and transmission of the laser, and to reshape the laser field distributions. The experimentally detected laser absorption and THz generation show one‐to‐one correspondence with the theoretical calculations. The strongest THz pulse emission that presents a 1.7 times improvement compared to the currently designed spintronic emitter is achieved. This work opens a new pathway to improve the performance of spintronic THz emitter from the perspective of optics.

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Broadband Terahertz Generation via the Interface Inverse Rashba-Edelstein Effect

Cited by 134 publications

References 49 publications

Terahertz Emission from Anomalous Hall Effect in a Single-Layer Ferromagnet

Terahertz Emission from Anomalous Hall Effect in a Single-Layer Ferromagnet

Terahertz Radiation Modulated by Confinement of Picosecond Current Based on Patterned Ferromagnetic Heterostructures

Highly Efficient Spintronic Terahertz Emitter Enabled by Metal–Dielectric Photonic Crystal

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