Terahertz-field-driven magnon upconversion in an antiferromagnet

Zhang, Zhuquan; Gao, Frank Y.; Chien, Yu-Che; Liu, Zi-Jie; Curtis, Jonathan B.; Sung, Eric R.; Ma, Xiaoxuan; Ren, Wei; Cao, Shixun; Narang, Prineha; von Hoegen, Alexander; Baldini, Edoardo; Nelson, Keith A.

doi:10.1038/s41567-023-02350-7

Cited by 22 publications

(2 citation statements)

References 45 publications

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“…Finally, we consider other potential mechanisms for nonlinearity that, for instance, directly arise from large spin deflections φ 2 , φ 3 and so on. Indeed, such terms have been reported to be responsible for the generation of higher harmonics and a cross-talk between the quasiferromagnetic and the quasi-antiferromagnetic modes in the orthoferrites 35,36 . However, as neither of these effects is seen in our data, we can rule out these mechanisms of nonlinearity as being responsible for the observed up-conversion.…”

Section: Article Theoretical Model and Simulationsmentioning

confidence: 99%

Canted spin order as a platform for ultrafast conversion of magnons

Leenders,

Afanasiev,

Kimel

et al. 2024

Nature

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Traditionally, magnetic solids are divided into two main classes—ferromagnets and antiferromagnets with parallel and antiparallel spin orders, respectively. Although normally the antiferromagnets have zero magnetization, in some of them an additional antisymmetric spin–spin interaction arises owing to a strong spin–orbit coupling and results in canting of the spins, thereby producing net magnetization. The canted antiferromagnets combine antiferromagnetic order with phenomena typical of ferromagnets and hold great potential for spintronics and magnonics1–5. In this way, they can be identified as closely related to the recently proposed new class of magnetic materials called altermagnets6–9. Altermagnets are predicted to have strong magneto-optical effects, terahertz-frequency spin dynamics and degeneracy lifting for chiral spin waves10 (that is, all of the effects present in the canted antiferromagnets11,12). Here, by utilizing these unique phenomena, we demonstrate a new functionality of canted spin order for magnonics and show that it facilitates mechanisms converting a magnon at the centre of the Brillouin zone into propagating magnons using nonlinear magnon–magnon interactions activated by an ultrafast laser pulse. Our experimental findings supported by theoretical analysis show that the mechanism is enabled by the spin canting.

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Section: Article Theoretical Model and Simulationsmentioning

confidence: 99%

Canted spin order as a platform for ultrafast conversion of magnons

Leenders,

Afanasiev,

Kimel

et al. 2024

Nature

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“…Terahertz time-domain spectroscopy (THz-TDS) has emerged as powerful tool to study charge [1][2], lattice [3], and spin [4][5][6][7][8] dynamics close to and far-from equilibrium on an ultrafast time scale. When combined with an external magnetic field, THz-TDS can be used to study emergent behavior.…”

Section: Introductionmentioning

confidence: 99%

Resolving individual carrier dynamics with kHz single-shot optical-pump terahertz-probe spectroscopy in high magnetic fields

Dastrup,

Miedaner,

Zhang

et al. 2024

Real-Time Measurements, Rogue Phenomena, and Single-Shot Applications IX

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We introduce a novel method of isolating carrier dynamics in optically excited semiconductors using optical-pump terahertz-probe spectroscopy, with a large external magnetic field to isolate different carrier types based on their cyclotron energies. We employ new echelon-based single-shot detection that utilizes a pair of 1D line array detectors which can read out at a 1 kHz repetition rate, reducing acquisition time by more than an order of magnitude. This enables collection of full 2D optical-pump/THz-probe scans at different magnetic fields. We demonstrate these capabilities by performing cyclotron resonance measurements in bulk silicon, and discover distinct carrier dynamics for electrons and holes, as well as their dependence on an external magnetic field.

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Extreme terahertz magnon multiplication induced by resonant magnetic pulse pairs

Huang,

Luo,

Mootz

et al. 2024

Nat Commun

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Nonlinear interactions of spin-waves and their quanta, magnons, have emerged as prominent candidates for interference-based technology, ranging from quantum transduction to antiferromagnetic spintronics. Yet magnon multiplication in the terahertz (THz) spectral region represents a major challenge. Intense, resonant magnetic fields from THz pulse-pairs with controllable phases and amplitudes enable high order THz magnon multiplication, distinct from non-resonant nonlinearities such as the high harmonic generation by below-band gap electric fields. Here, we demonstrate exceptionally high-order THz nonlinear magnonics. It manifests as 7th-order spin-wave-mixing and 6th harmonic magnon generation in an antiferromagnetic orthoferrite. We use THz two-dimensional coherent spectroscopy to achieve high-sensitivity detection of nonlinear magnon interactions up to six-magnon quanta in strongly-driven many-magnon correlated states. The high-order magnon multiplication, supported by classical and quantum spin simulations, elucidates the significance of four-fold magnetic anisotropy and Dzyaloshinskii-Moriya symmetry breaking. Moreover, our results shed light on the potential quantum fluctuation properties inherent in nonlinear magnons.

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Terahertz-field-driven magnon upconversion in an antiferromagnet

Cited by 22 publications

References 45 publications

Canted spin order as a platform for ultrafast conversion of magnons

Canted spin order as a platform for ultrafast conversion of magnons

Resolving individual carrier dynamics with kHz single-shot optical-pump terahertz-probe spectroscopy in high magnetic fields

Extreme terahertz magnon multiplication induced by resonant magnetic pulse pairs

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