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Modulation spectroscopy with ultracold fermions in an optical lattice

C. Kollath, A. Iucci, I. P. McCulloch, and T. Giamarchi
Phys. Rev. A 74, 041604(R) – Published 20 October 2006

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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  • Received 3 August 2006

DOI:https://doi.org/10.1103/PhysRevA.74.041604

©2006 American Physical Society

Authors & Affiliations

C. Kollath1, A. Iucci1, I. P. McCulloch2, and T. Giamarchi1

  • 1DPMC-MaNEP, University of Geneva, 24 Quai Ernest-Ansermet, CH-1211 Geneva, Switzerland
  • 2Institute for Theoretical Physics, RWTH Aachen, D-52056 Aachen, Germany

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Issue

Vol. 74, Iss. 4 — October 2006

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