Atomic Physics Seminar: Mekena Metcalf, University of California at Merced, “Quantum Transport of Ultra-Cold Fermions in Optical Potentials”

Event time: 
Tuesday, November 14, 2017 - 1:00pm to 2:00pm
Sloane Physics Laboratory (SPL), 52 See map
217 Prospect Street
New Haven, CT 06511
Event description: 

Dynamical measurements of ultra-cold Fermi gases confined to optical potentials can be used to prove features of quantum matter. Control of external parameters like tunneling strengths, lattice geometries and interactions enables investigations of topology and non-equilibrium particle transport. Optical lattice geometry, created by counter propagating laser beams, can be engineered to optimize matter-wave propagation along patterned paths difficult to access in the solid-state. We investigate 2D ladder systems with a particle number bias on one half of the lattice and provide a mechanism for controlling the group velocity of fermions as they propagate to the opposite boundary. Transport behavior in the presence of a flat energy band is also elucidated. Furthermore, we propose protocols to prove topological features of the one-dimensional Su-Schrieffer-Heeger model using an ultra-cold Fermi gas confined to an optical ring potential, cut by an off-resonant laser sheet. Single-particle injection and atomic depletion are implemented to detect edge-states dynamically for non-interacting fermions. Signatures of topology in the presence of contact interactions can be found in selected correlations as the system boundary suddenly changes from periodic to open and exhibit memory effects of the initial state, distinguishing different configurations.

Host: Nir Navon