title: Creating State-Dependent Lattices for Ultracold Fermions by Magnetic Gradient Modulation.
abstract: We demonstrate a versatile method for creating state-dependent optical lattices by applying a magnetic field gradient modulated in time. This allows for tuning the relative amplitude and sign of the tunneling for different internal states. We observe substantially different momentum distributions depending on the spin state of fermionic ^{40}K atoms. Using dipole oscillations, we probe the spin-dependent band structure and find good agreement with theory. In situ expansion dynamics demonstrate that one state can be completely localized while others remain itinerant. A systematic study shows negligible heating and lifetimes of several seconds in the Hubbard regime.
authors: Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland.
authors: Gregor
authors: G
authors: Jotzu
authors: Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland.
authors: Michael
authors: M
authors: Messer
authors: Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland.
authors: Frederik
authors: F
authors: Görg
authors: Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland.
authors: Daniel
authors: D
authors: Greif
authors: Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland.
authors: Rémi
authors: R
authors: Desbuquois
authors: Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland.
authors: Tilman
authors: T
authors: Esslinger