Abstract
We show a photoinduced magnetic phase transition from antiferromagnetic to ferromagnetic ordering in a strongly correlated manganite during ~100 fs laser pulses when optical polarization still interacts with spins. This reveals an initial quantum coherent regime of magnetism, which is driven by fast quantum spin-flip fluctuations correlated with a coherent superposition of many-body electronic states.
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References
J.-Y Bigot, M. Vomir, E. Beaurepaire, “Coherent ultrafast magnetism induced by femtosecond laser pulses”. Nature Phys. 5, 515–520 (2009).
T. Li et al., “Femtosecond switching of magnetism via strongly correlated spin–charge quantum excitations” Nature, 496, 69 (2013)
Acknowledgments
This work was supported by the National Science Foundation (contract no. DMR-1055352) and by the U.S. Department of Energy No. DE-AC02-7CH11358.
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Li, T. et al. (2015). Quantum Femtosecond Magnetism in a Strongly Correlated Manganese Oxide. In: Bigot, JY., Hübner, W., Rasing, T., Chantrell, R. (eds) Ultrafast Magnetism I. Springer Proceedings in Physics, vol 159. Springer, Cham. https://doi.org/10.1007/978-3-319-07743-7_68
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DOI: https://doi.org/10.1007/978-3-319-07743-7_68
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