Terahertz light–driven coupling of antiferromagnetic spins to lattice

Mashkovich, E. A.; Grishunin, K. A.; Dubrovin, R. M.; Zvezdin, A. K.; Pisarev, R. V.; Kimel, A.V.

doi:10.1126/science.abk1121

Cited by 69 publications

(48 citation statements)

References 38 publications

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“…Tailored light excitation has recently emerged as a powerful tool to study complex phenomena in quantum materials and can serve as a dynamic tuning knob to unveil the coupling between distinct collective modes. [9][10][11][12][13][14][15] Despite the potential, such a methodology has never been applied to study magnon-magnon mode mixings, which are usually hidden in conventional spectroscopies dominated by linear magnon excitations. 16 Here, we explore an uncharted territory in nonlinear coupled magnonics by measuring the coherence and interactions between two distinct magnon modes in the canted antiferromagnet YFeO 3 (YFO) at room temperature.…”

Section: Main Textmentioning

confidence: 99%

Three-wave mixing of anharmonically coupled magnons

Zhang¹,

Gao²,

Curtis³

et al. 2023

Preprint

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Magnons are quantized collective spin-wave excitations in magnetically ordered systems. Revealing their interactions among these collective modes is crucial for the understanding of fundamental many-body effects in such systems and the development of high-speed information transport and processing devices based on them. Nevertheless, identifying couplings between individual magnon modes remains a long-standing challenge. Here, we observe unambiguous spectroscopic fingerprints of anharmonic coupling between distinct magnon modes in an antiferromagnet, as evidenced by coherent photon emission at the sum and difference frequencies of the two modes. This discovery is enabled by driving two magnon modes coherently with a pair of tailored terahertz fields and then disentangling a mixture of nonlinear responses with different origins, symmetries, and field dependences in a two-dimensional frequency-frequency correlation map. Our approach provides a new platform for generating nonlinear magnonmagnon mixings and establishes a systematic means of unveiling intricate couplings among distinct low-energy collective modes.

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Section: Main Textmentioning

confidence: 99%

Three-wave mixing of anharmonically coupled magnons

Zhang¹,

Gao²,

Curtis³

et al. 2023

Preprint

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show abstract

“…The importance of the lattice in demagnetization suggests that it may provide a route to directly control spin dynamics via excitation before the laser pulse that induces the spin dynamics. Recently, the lattice has been used as a route to directly control matter through the excitation of infrared (IR) phonon modes (13)(14)(15)(16)(17)(18)(19). However, the idea of phonomagnetism (20,21), i.e., manipulation of spins via nuclear dynamics, only now is beginning to be examined as an additional degree of freedom via which spin can be dynamically manipulated.…”

Section: Introductionmentioning

confidence: 99%

Making a case for femto-phono-magnetism with FePt

et al. 2022

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In the field of femtomagnetism, magnetic matter is controlled by ultrafast laser pulses; here, we show that coupling phonon excitations of the nuclei to spin and charge leads to femto-phono-magnetism, a powerful route to control magnetic order at ultrafast times. With state-of-the-art theoretical simulations of coupled spin, charge, and lattice dynamics, we identify strong nonadiabatic spin-phonon coupled modes that dominate early time spin dynamics. Activating these phonon modes that we show leads to an additional (up to 40% extra) loss of moment in iron-platinum occurring within 40 femtoseconds of the pump laser pulse. Underpinning this enhanced ultrafast loss of spin moment, we identify a physical mechanism in which minority spin current drives an enhanced intersite minority charge transfer, in turn promoting increased on-site spin flips. Our finding demonstrates that the nuclear system, often assumed to play the role of an energy and angular momentum sink, when selectively preexcited, can play a profound role in controlling femtosecond spin dynamics in materials.

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“…Light is a valuable tool for characterizing diverse material properties, including topological quantities such as the Berry curvature [1][2][3][4][5][6][7][8]. Light can also drive electronic, phononic and nuclear-spin excitations [9,10] and even trigger ionic [11][12][13] and electronic [14][15][16] phase transitions. On the other hand, light-matter interactions can be used to detect and generate light.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear nonreciprocal photocurrents under phonon dressing

Wang

2022

Phys. Rev. B

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Nonlinear optical (NLO) effects have attracted great interest recently. However, by far the computational studies on NLO use the independent particle approximation and ignore manybody effects. Here we develop a generic Green's function framework to calculate the NLO response functions, which can incorporate various many-body interactions. We focus on the electron-phonon coupling and reveal that phonon dressing can make significant impacts on nonlinear photocurrent, such as the bulk photovoltaic (BPV) and bulk spin photovoltaic (BSPV) currents. BPV/BSPV should be zero for centrosymmetric crystals, but when phonons are driven out-of-equilibrium, by for example, a temperature gradient ∇𝑇, the optical selections rules are altered and phonon-pumped BPV/BSPV currents can be non-zero in nominally centrosymmetric crystal. Moreover, we elucidate that such NLO responses under nonequilibrium phonon dressing can be nonreciprocal, as the direction of the current does not necessarily get reversed when the direction of the temperature gradient is reversed.

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Terahertz light–driven coupling of antiferromagnetic spins to lattice

Cited by 69 publications

References 38 publications

Three-wave mixing of anharmonically coupled magnons

Three-wave mixing of anharmonically coupled magnons

Making a case for femto-phono-magnetism with FePt

Nonlinear nonreciprocal photocurrents under phonon dressing

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