Optical Lattice with Torus Topology

JQI-QuICS-CMTC Seminar

Speaker: 
Hwanmun Kim (JQI)
Time: 
Friday, November 9, 2018 - 12:00pm
Location: 
PSC 2136
We propose an experimental scheme to construct an optical lattice where the atoms are confined to the surface of a torus. This construction can be realized with spatially shaped laser beams which could be realized with recently developed high resolution imaging techniques. We numerically study the feasibility of this proposal by calculating the tunneling strengths for atoms in the torus lattice. To illustrate the non-trivial role of topology in atomic dynamics on the torus, we study the quantized superfluid currents and fractional quantum Hall (FQH) states on such a structure. For FQH states, we numerically investigate the robustness of the topological degeneracy and propose an experimental way to detect such a degeneracy. Our scheme for torus construction can be generalized to surfaces with higher genus for exploration of richer topological physics.
 
In collaboration with Guanyu Zhu, J. V. Porto, Mohammad Hafezi
 
Notes: Lunch served at 12:00 pm, talk at 12:15 pm.