Ultrafast photoinduced linear and circular optical anisotropy in the multiferroic hexagonal manganite YMnO3статья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 16 января 2019 г.
Аннотация:Femtosecond laser spectroscopy is an important tool for investigating fundamental processes of light-matter interaction. Here, we report on transient optical anisotropy in the multiferroic hexagonal manganite YMnO3 excited by linearly or circularly polarized laser pulses with similar to 17 fs and similar to 34 fs duration. Spectral dependencies of photoinduced optical rotation and ellipticity at different temperatures are analyzed by considering ultrafast population and relaxation processes near the interband transitions from the hybridized O(2p)-Mn(3d) to the Mn(3d) states at photon energies around 1.6 eV. A Raman coherence time of similar to 10 fs between the excited Gamma(5) vertical bar x > and Gamma(5) vertical bar y > states and a relaxation time of similar to 500 fs between the Gamma(5) vertical bar x, y > and Gamma(1) vertical bar g > states for the electronic transition Gamma(1) -> Gamma(5) are determined in that way. The ultrashort Raman coherence time is related to the strong electron Coulomb interaction for the Gamma(5) vertical bar x, y > states.