Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster: Quantum Optics and Photonics I
Q 15.22: Poster
Montag, 23. März 2015, 17:00–19:00, C/Foyer
Realizing spin-dependent lattices for ultracold atoms with magnetic gradient modulation — •Frederik Görg, Gregor Jotzu, Michael Messer, Rémi Desbuquois, Daniel Greif, and Tilman Esslinger — Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland
Time-modulated optical lattices have been demonstrated to allow for the dynamical control of atomic tunneling and the realization of effective lattice Hamiltonians with a non-trivial topological band structure. In order to realize spin-dependent Hamiltonians, an oscillating magnetic gradient can be used, which couples differently to the individual spin components of the atomic gas owing to the difference in magnetic moments. This allows for the realization of spin-dependent lattices due to the selective renormalization of the tunneling amplitudes of each spin component. In this way, situations where one spin component is pinned to the lattice and the other one remains itinerant are achievable. Furthermore, the combination of an oscillating gradient with a time-modulation of the optical lattice allows for tailoring Hamiltonians with nontrivial topological properties. As an example, the use of two spin components with opposite magnetic moments realizes the celebrated Kane-Mele model.