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A nearly single cycle intense terahertz (THz) pulse with peak electric and magnetic fields of 0.5 MV=cm and 0.16 T, respectively, excites both modes of spin resonances in the weak antiferromagnet FeBO 3 . The high frequency quasiantiferromagnetic mode is excited resonantly and its amplitude scales linearly with the strength of the THz magnetic field, whereas the low frequency quasiferromagnetic mode is excited via a nonlinear mechanism that scales quadratically with the strength of the THz electric field and can be regarded as a THz inverse Cotton-Mouton effect. THz optomagnetism is shown to be more energy efficient than similar effects reported previously for the near-infrared spectral range.

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“…3(d)] does not allow ascribing it to spin dynamics. Hence the signal must have a different origin [48]. Similar to Ref.…”

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confidence: 85%

Terahertz Optomagnetism: Nonlinear THz Excitation of GHz Spin Waves in Antiferromagnetic FeBO3

Mashkovich¹,

Grishunin

Mikhaylovskiy

et al. 2019

Phys. Rev. Lett.

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References and further reading

2011

Energy Medicine East and West

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Magnetic field expulsion in optically driven YBa2Cu3O6.48

Fava,

De Vecchi,

Jotzu

et al. 2024

Nature

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Coherent optical driving in quantum solids is emerging as a research frontier, with many reports of interesting non-equilibrium quantum phases1–4 and transient photo-induced functional phenomena such as ferroelectricity5,6, magnetism7–10 and superconductivity11–14. In high-temperature cuprate superconductors, coherent driving of certain phonon modes has resulted in a transient state with superconducting-like optical properties, observed far above their transition temperature Tc and throughout the pseudogap phase15–18. However, questions remain on the microscopic nature of this transient state and how to distinguish it from a non-superconducting state with enhanced carrier mobility. For example, it is not known whether cuprates driven in this fashion exhibit Meissner diamagnetism. Here we examine the time-dependent magnetic field surrounding an optically driven YBa2Cu3O6.48 crystal by measuring Faraday rotation in a magneto-optic material placed in the vicinity of the sample. For a constant applied magnetic field and under the same driving conditions that result in superconducting-like optical properties15–18, a transient diamagnetic response was observed. This response is comparable in size with that expected in an equilibrium type II superconductor of similar shape and size with a volume susceptibility χv of order −0.3. This value is incompatible with a photo-induced increase in mobility without superconductivity. Rather, it underscores the notion of a pseudogap phase in which incipient superconducting correlations are enhanced or synchronized by the drive.

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Cited by 6 publications

References 8 publications

Terahertz Optomagnetism: Nonlinear THz Excitation of GHz Spin Waves in Antiferromagnetic FeBO3

Terahertz Optomagnetism: Nonlinear THz Excitation of GHz Spin Waves in Antiferromagnetic FeBO3

References and further reading

Magnetic field expulsion in optically driven YBa2Cu3O6.48

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