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An effective magnetic field from optically driven phonons

Abstract

Light fields at terahertz and mid-infrared frequencies allow for the direct excitation of collective modes in condensed matter, which can be driven to large amplitudes. For example, excitation of the crystal lattice1,2 has been shown to stimulate insulator–metal transitions3,4, melt magnetic order5,6 or enhance superconductivity7,8,9. Here, we generalize these ideas and explore the simultaneous excitation of more than one lattice mode, which are driven with controlled relative phases. This nonlinear mode mixing drives rotations as well as displacements of the crystal-field atoms, mimicking the application of a magnetic field and resulting in the excitation of spin precession in the rare-earth orthoferrite ErFeO3. Coherent control of lattice rotations may become applicable to other interesting problems in materials research—for example, as a way to affect the topology of electronic phases.

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Figure 1: Structure and magnetic properties.
Figure 2: Transient birefringence measurement.
Figure 3: Pump wavelength, fluence, polarization and external field dependence at 100 K.
Figure 4: Temperature dependence.
Figure 5: Calculated ionic and magnetic dynamics.

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Acknowledgements

We are grateful to A. Subedi, D. M. Juraschek, M. Fechner and N. A. Spaldin for sharing the calculated phonon eigenvectors and for useful discussions. We thank R. V. Pisarev for providing the samples. We additionally acknowledge support from J. Harms (for graphics), D. Nicoletti (for FTIR measurements) and G. Meier (for sample characterization). A.V.K., R.V.M. and D.B. thank I. Razdolski for fruitful discussions of the first experiments and Th. Rasing for continuous support. The research leading to these results received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013)/ERC Grant Agreement no. 319286 (QMAC). We acknowledge support from the Deutsche Forschungsgemeinschaft via the excellence cluster ‘The Hamburg Centre for Ultrafast Imaging—Structure, Dynamics and Control of Matter at the Atomic Scale’. A.V.K., R.V.M. and D.B. acknowledge partial support by the European Union’s Seventh Framework Programme (FP7/2007-2013) Grant No. 281043 (Femtospin).

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Contributions

A.Cavalleri conceived the project together with T.F.N. T.F.N. and A.Cartella built the mid-infrared pump/Faraday-rotation probe experimental set-up with help from A.Cantaluppi and M.F. T.F.N. and A.Cartella performed the measurements. A.Cartella and T.F.N. developed the 1D-FDTD code and performed the simulations with help from R.V.M. (for the solution of the Landau–Lifshitz equation). T.F.N. analysed the experimental data. A.V.K., R.V.M. and D.B. identified the material system for the project and helped in the analysis of the data. R.M. collaborated in the interpretation of the data. The manuscript was written by T.F.N. and A.Cavalleri, with feedback from all co-authors.

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Correspondence to T. F. Nova or A. Cavalleri.

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The authors declare no competing financial interests.

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Nova, T., Cartella, A., Cantaluppi, A. et al. An effective magnetic field from optically driven phonons. Nature Phys 13, 132–136 (2017). https://doi.org/10.1038/nphys3925

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