Chern Kondo Insulator in an Optical Lattice

Abstract

We propose to realize and observe Chern Kondo insulators in an optical superlattice with laser-assisted $s$ and $p$ orbital hybridization and synthetic gauge field, which can be engineered based on the recent cold atom experiments. Considering a double-well square optical lattice, the localized $s$ orbitals are decoupled from itinerant $p$ bands and are driven into a Mott insulator due to strong Hubbard interaction. Raman laser beams are then applied to induce tunnelings between $s$ and $p$ orbitals, and generate a staggered flux simultaneously. Due to the strong Hubbard interaction of $s$ orbital states, we predict the existence of a critical Raman laser-assisted coupling, beyond which the Kondo screening is achieved and then a fully gapped Chern Kondo phase emerges, with the topology characterized by integer Chern numbers. Being a strongly correlated topological state, the Chern Kondo phase is different from the single-particle quantum anomalous Hall state, and can be identified by measuring the band topology and double occupancy of $s$ orbitals. The experimental realization and detection of the predicted Chern Kondo insulator are also proposed.

5 pages, 4 figures, plus Supplementary Material

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Cited by in corpus (10)

• Topological quantum matter with cold atoms
• Exploring the Kondo model in and out of equilibrium with alkaline-earth atoms
• Topological Kondo insulators in one dimension: Continuous Haldane-type ground-state evolution from the strongly-interacting to the non-interacting limit
• Quantum Dynamical Phase Transition in a Spin-Orbit Coupled Bose Condensate
• A Scaling Behavior of Bloch Oscillation in Weyl Semimetals
• Synthetic topological Kondo insulator in a pumped optical cavity
• Inexorable Edge Kondo Breakdown in Topological Kondo Insulators
• Magnetic effects on Chern Kondo insulator
• Simulating the Palmer-Chalker state in an orbital superfluid
• Majorana Flat Bands in the Vortex Line of Superconducting Weyl Semimetals