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Spin correlations and doublon production rate for fermionic atoms in modulated optical lattices

Akiyuki Tokuno and Thierry Giamarchi
Phys. Rev. A 85, 061603(R) – Published 19 June 2012

Abstract

We compute the integrated doublon production rate in response to a lattice modulation for two-component fermions in an optical lattice. We derive a general formula for the integrated intensity, valid in the presence of inhomogeneous potentials such as the trap, which gives the integrated intensity in terms of equal time correlation functions only. Such a formula is thus well suited for direct numerical calculations. We show that, in the limit of large repulsion for commensurate fillings, or for temperature ranges for which the hopping is incoherent, the integrated doublon spectrum is directly related to the nearest-neighbor spin-spin correlation function. We compute its temperature dependence in this regime using finite temperature quantum Monte Carlo calculation.

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  • Received 4 May 2012

DOI:https://doi.org/10.1103/PhysRevA.85.061603

©2012 American Physical Society

Authors & Affiliations

Akiyuki Tokuno and Thierry Giamarchi

  • DPMC-MaNEP, University of Geneva, 24 Quai Ernest-Ansermet CH-1211 Geneva, Switzerland

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Issue

Vol. 85, Iss. 6 — June 2012

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