Bulletin of the American Physical Society
APS March Meeting 2021
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session J10: Flat Band Effects in Ultracold Atomic and Solid-State Materials
3:00 PM–4:48 PM,
Tuesday, March 16, 2021
Sponsoring Unit: DAMOP
Chair: Dan Stamper-Kurn, University of California, Berkeley
Abstract: J10.00002 : Ultracold atoms in Lieb lattices
3:36 PM–4:12 PM
Lattice structure is one of the most important properties of strongly correlated systems which determines the ground state quantum phases. With optical lattices, variety of lattice structures can be realized by changing laser configurations. We have realized an optical Lieb lattice which has a flat energy dispersion in the first excited band. By tuning intensities and relative phases of lattice laser beams, lattice parameters such as tunneling and energy offset of each sublattice can be fully controllable. The dynamical control of these parameters allows us to load both Bose condensates and degenerate fermions into the flat band. The band flatness is confirmed by observing the frozen motion of matter waves. The band structure is further investigated by inducing oscillation modes of condensates and the interaction effect on the flat dispersion is successfully observed. For fermions, the loading process can be regarded as a realization of "spatial adiabatic passage", in which quantum particles are transported between spaticaly isolated states without being observed at the intermediate region. In this talk, I will report these series of experiments and future possibilities of approaching exotic magnetic states with the optical Lieb lattice.
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