Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-10-20
Nature Physics advanced online publication 5 Dec 2010
Physics
Condensed Matter
Strongly Correlated Electrons
4 figures
Scientific paper
10.1038/nphys1831
By using nearly-single-cycle optical pulses in the near infrared, we measure the time-dependent optical properties of the Mott insulator ET-F2TCNQ after prompt photo-excitation. We observe a rapid drop in spectral weight at the Mott gap, and oscillations in the optical conductivity, revealing coherent electronic-structural rearrangements on the timescale of electron correlations. A quantum dynamic model based on the Fermi Hubbard Hamiltonian predicts recurrence oscillations between bound and unbound holon-doublon pairs, closely matching the experimentally observed frequency. To date, coherent many body processes of this kind have only been experimentally accessible in ultracold gases, where the correlation energies are re-normalized to lower values and the dynamics is correspondingly slower. We bridge the gap between optics on extreme timescales and the control of strongly correlated quantum gases, and identify the first steps in the coherent response of a Mott insulator.
Ardavan Arzhang
Bonora Stefano
Brida D.
Cavalleri Andrea
Cerullo Giulio
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