A. Dirks, K. Mikelsons, H. R. Krishnamurthy, J. K. Freericks
Using a recently developed strong-coupling method, we present a comprehensive theory for doublon production processes in modulation spectroscopy of a system of ultracold fermionic atoms in an optical lattice. The theoretical predictions compare very well to the experimental time traces of doublon production. For experimentally feasible conditions, we provide a quantitative prediction for the presence of a nonlinear "two-photon" excitation at strong modulation amplitudes.
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http://arxiv.org/abs/1304.7802
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