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Modulation spectroscopy with ultracold fermions in an optical lattice

McCulloch, I. P.
Published in Physical Review. A. 2006, vol. 74, no. 4
Abstract We propose an experimental setup of ultracold fermions in an optical lattice to determine the pairing gap in a superfluid state and the spin ordering in a Mott-insulating state. The idea is to apply a periodic modulation of the lattice potential and to use the thereby induced double occupancy to probe the system. We show by full time-dependent calculation using the adaptive time-dependent density-matrix renormalization-group method that the position of the peak in the spectrum of the induced double occupancy gives the pairing energy in a superfluid and the interaction energy in a Mott insulator, respectively. In the Mott insulator we relate the spectral weight of the peak to the spin ordering at finite temperature using perturbative calculations.
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KOLLATH, Corinna et al. Modulation spectroscopy with ultracold fermions in an optical lattice. In: Physical Review. A, 2006, vol. 74, n° 4. https://archive-ouverte.unige.ch/unige:36080

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Deposited on : 2014-04-28

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