2014/05/28 by Saubhik Sarkar, S. Langer, Stephan Langer +2 · 1 citation
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Dissipative system #Fermion #Master equation #Optical lattice #Photon #Physics #Quantum #Quantum decoherence #Quantum many-body systems #Quantum mechanics #Scattering #Strong Light-Matter Interactions #Superfluidity #cond-mat.quant-gas
paper · pdf · doi:10.1103/physreva.90.023618
published as Phys. Rev. A 90, 023618 (2013) · 18 pages, 7 figures
arxiv created 2014/05/28 · openalex publication_date 2014/08/13 · arxiv updated 2015/01/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the many-body dissipative dynamics of fermionic atoms in an optical lattice in the presence of incoherent light scattering. Deriving and solving a master equation to describe this process microscopically for many particles, we observe contrasting behavior in terms of the robustness against this type of heating for different many-body states. In particular, we find that the magnetic correlations exhibited by a two-component gas in the Mott insulating phase should be particularly robust against decoherence from light scattering, because the decoherence in the lowest band is suppressed by a larger factor than the time scales for effective superexchange interactions that drive coherent dynamics. Furthermore, the derived formalism naturally generalizes to analogous states with SU(N) symmetry. In contrast, for typical atomic and laser parameters, two-particle correlation functions describing bound dimers for strong attractive interactions exhibit superradiant effects due to the indistinguishability of off-resonant photons scattered by atoms in different internal states. This leads to rapid decay of correlations describing off-diagonal long-range order for these states. Our predictions should be directly measurable in ongoing experiments, providing a basis for characterizing and controlling heating processes in quantum simulation with fermions.