An effective magnetic field from optically driven phonons

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2017
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Nova, Tobia F.
Cartella, Andrea
Cantaluppi, Alice
Först, Michael
Mikhaylovskiy, Rostislav V.
Kimel, Aleksei V.
Merlin, Roberto
Cavalleri, Andrea
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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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ISO 690NOVA, Tobia F., Andrea CARTELLA, Alice CANTALUPPI, Michael FÖRST, Davide BOSSINI, Rostislav V. MIKHAYLOVSKIY, Aleksei V. KIMEL, Roberto MERLIN, Andrea CAVALLERI, 2017. An effective magnetic field from optically driven phonons. In: Nature Physics. Springer Nature. 2017, 13, pp. 132-136. ISSN 1745-2473. eISSN 1745-2481. Available under: doi: 10.1038/nphys3925
BibTex
@article{Nova2017effec-53332,
  year={2017},
  doi={10.1038/nphys3925},
  title={An effective magnetic field from optically driven phonons},
  volume={13},
  issn={1745-2473},
  journal={Nature Physics},
  pages={132--136},
  author={Nova, Tobia F. and Cartella, Andrea and Cantaluppi, Alice and Först, Michael and Bossini, Davide and Mikhaylovskiy, Rostislav V. and Kimel, Aleksei V. and Merlin, Roberto and Cavalleri, Andrea}
}
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