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Quantum interference between charge excitation paths in a solid state Mott insulator


Reference:

Wall, S., Brida, D., Clark, S. R., Ehrke, H. P., Jaksch, D., Ardavan, A., Bonora, S., Uemura, H., Takahashi, Y., Hasegawa, T., Okamoto, H., Cerullo, G. and Cavalleri, A., 2011. Quantum interference between charge excitation paths in a solid state Mott insulator. Nature Physics, 7, pp. 114-118.

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    Official URL:

    http://dx.doi.org/10.1038/nphys1831

    Abstract

    The competition between electron localization and de-localization in Mott insulators underpins the physics of strongly-correlated electron systems. Photo-excitation, which re-distributes charge between sites, can control this many-body process on the ultrafast timescale. To date, time-resolved studies have been performed in solids in which other degrees of freedom, such as lattice, spin, or orbital excitations come into play. However, the underlying quantum dynamics of bare electronic excitations has remained out of reach. Quantum many-body dynamics have only been detected in the controlled environment of optical lattices where the dynamics are slower and lattice excitations are absent. By using nearly-single-cycle near-IR pulses, we have measured coherent electronic excitations in the organic salt ET-F2TCNQ, a prototypical one-dimensional Mott Insulator. After photo-excitation, a new resonance appears on the low-energy side of the Mott gap, which oscillates at 25 THz. Time-dependent simulations of the Mott-Hubbard Hamiltonian reproduce the oscillations, showing that electronic delocalization occurs through quantum interference between bound and ionized holon-doublon pairs.

    Details

    Item Type Articles
    CreatorsWall, S., Brida, D., Clark, S. R., Ehrke, H. P., Jaksch, D., Ardavan, A., Bonora, S., Uemura, H., Takahashi, Y., Hasegawa, T., Okamoto, H., Cerullo, G. and Cavalleri, A.
    DOI10.1038/nphys1831
    Uncontrolled Keywordscond-mat.str-el
    DepartmentsFaculty of Science > Physics
    RefereedYes
    StatusPublished
    ID Code47342
    Additional Information4 figures and supplementary information

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